The painkiller, Advil® contains the active ingredient ibuprofen (IB), which has a pKb of
5.20. If the pH of a solution containing a dissolved tablet of Advil® was found to be
8.20, what was the equilibrium concentration (mol/L) of ibuprofen?
IB + H2O ⇀ IBH+ + OH−
A) 3.7 × 10−4
B) 5.5 × 10−5
C) 2.8 × 10−7
D) 4.0 × 10−7
E) 9.2 × 10−7
This problem is providing the basic dissociation constant of ibuprofen (IB) as 5.20, its pH as 8.20 and is requiring the equilibrium concentration of the aforementioned drug by giving the chemical equation at equilibrium it takes place. The obtained result turned out to be D) 4.0 × 10−7 M, according to the following work:
First of all, we set up an equilibrium expression for the given chemical equation at equilibrium, in which water is omitted for it is liquid and just aqueous species are allowed to be included:
[tex]Kb=\frac{[IBH^+][OH^-]}{[IB]}[/tex]
Next, we calculate the concentration of hydroxide ions and the Kb due to the fact that both the pH and pKb were given:
[tex]pOH=14-8.20=5.80[/tex]
[tex][OH^-]=10^{-5.8}=1.585x10^{-6}M[/tex]
[tex]Kb=10^{-5.20}=6.31x10^{-6}[/tex]
Then, since the concentration of these ions equal that of the conjugated acid of the ibuprofen (IBH⁺), we can plug in these and the Kb to obtain:
[tex]6.31x10^{-6}=\frac{(1.585x10^{-6})(1.585x10^{-6})}{[IB]}[/tex]
Finally, we solve for the equilibrium concentration of ibuprofen:
[tex][IB]=\frac{(1.585x10^{-6})(1.585x10^{-6})}{6.31x10^{-6}}=4.0x10^{-7}[/tex]
Learn more:
(Weak base equilibrium calculation) https://brainly.com/question/9426156
Speed is the rate of change of position expressed as _____ traveled per unit of time.
Answer:
distance traveled per unit of time.
Here's the question ~
Heat treatment of muscular pain involves radiation of wavelength of about 900 nm (nm = 10-⁹ m). which spectral line of H - atom is suitable for this purpose ?
[ RH = 1 × 10⁵ cm-¹ ]
[ h = 6.6 × 10-³⁴ Js ]
[ c = 3 × 10⁸ m/s ]
Thanks for Answering !
Using the Rydberg formula, the spectral line of H - atom is suitable for this purpose is Paschen, ∞ → 3.
Using the Rydberg formula;1/λ = RH(1/nf^2 - 1/ni^2)
Given that;
λ = wavelength
RH = Rydberg constant
nf = final state
ni = initial state
When final state = 3 and initial state = ∞Then;
1/λ = 1 × 10^7 m-1 (1/3^2 - 1/ ∞^2)
1/λ = 1 × 10^7 m-1 (1/3^2 )
λ = 900 nm
Hence, the correct answer is Paschen, ∞ → 3
Learn more about the Rydberg formula; https://brainly.com/question/17753747
True or False? The energy carried by a sound
wave is blocked by collisition
between the particles in the
material the name is traveling
in
Answer:
true
Explanation:
i checked on moogle
(GIVING BRAINLIEST, 5 STARS , THANKS AND 20 POINTS NO LINKS PLEASE THIS IS MY LAST ASSUGNMENT TO PASS BECAUSE I HAVE A 78% PLEASE QUICK)
Jason completed an experiment and found the materials that conduct electricity and the materials that do not conduct electricity well. He made a table of his findings, but he made one mistake. Review his table, and choose the best answer that will correct the error in his table.
Conducts Electricity Does Not Conduct Electricity Well
Silver necklace
Rubber boot
Cast iron frying pan
Plastic cell phone case
Ceramic coffee cup
Glass cup
A. A rubber boot does not conduct electricity well, so it is in the wrong group.
B. A glass coffee cup conducts electricity well, so it is in the wrong group.
C. A plastic cell phone case conducts electricity well, so it is in the wrong group.
D. A cast iron frying pan does not conduct electricity well, so it is in the wrong group.
Answer:
A.) A rubber boot does not conduct electricity well, so it is in the wrong group.
Explanation:
A glass coffee cup conducts electricity well when it is heated
Answer:
i think the answer is a rubber boot if i am correct
Explanation:
which are the only two elements liquid at room temperature?
Answer:
mercury and bromine are the only two elements
explain how redox reactions are involved in energy exchanges
Redox reactions involve one substance losing electrons (oxidized) and another substance gaining electrons (reduced) in the same reaction. As electrons are transferred between substances, the electrons lose potential energy and energy is released.
Find the volume of hydrogen gas that reacts with 200 cm of nitrogen gas
measured at the same temperature and pressure.
N2 + 3H2(g) 2NH3(g)
Answer:
15 L
Explanation:
The important thing to remember about reactions that involve gases kept under the same conditions for pressure and temperature is that the mole ratios that exist between the gases are equivalent to volume ratios.
This can be proven using the ideal gas law equation for two gases kept at a temperature
T
and a pressure
P
.
P
⋅
V
1
=
n
1
⋅
R
⋅
T
→
the ideal gas law equation for the first gas
P
⋅
V
2
=
n
2
⋅
R
⋅
T
→
the ideal gas law equation for the second gas
Divided these two equations to get
P
⋅
V
1
P
⋅
V
2
=
n
1
⋅
R
⋅
T
n
2
⋅
R
⋅
T
This means that you have
n
1
n
2
=
V
1
V
2
→
the mole ratio is equivalent to the volume ratio
In your case, the balanced chemical equation looks like this
N
2(g]
+
3
H
2(g]
→
2
NH
3(g]
The problem tells you that this reaction takes place at constant temperature and pressure. You don't need to know the exact values, you just need to know that they are constant for all three chemical species.
You can thus say that since you have a
1
:
3
mole ratio between nitrogen gas and oxygen gas, you will also have a
1
:
3
the volume ratio between these two gases
n
N
2
n
H
2
=
V
N
2
V
H
2
=
1
3
The volume of hydrogen gas needed to react with that much nitrogen gas will thus be
5.0
L N
2
⋅
3
L H
2
1
L N
2
=
15 L H
2
What chemical processes are involved in chemistry? I need 3+ chemical changes that occur during the chemistry process..
Answer:
Explanation:
Chemists categorize chemical changes into three main classes: inorganic chemical changes, organic chemical changes, and biochemical changes.
Burning of paper and log of wood.
Digestion of food.
Boiling an egg.
Chemical battery usage.
Electroplating a metal.
Baking a cake.
Milk going sour.
Various metabolic reactions that take place in the cells.
Chemical reactions project modeling the conservation of mass pls help just need answer
The law of conservation of mass states that
In any chemical reaction mass is neither created nor destroyed rather it remains conserved
Mass of reactants=Mass of productsLook the chemical reaction below
[tex]\\ \sf\longmapsto 2H_2+O_2=2H_2O[/tex]
Count the mass on both sides and simplify
It will be 18g and ratio remains one2.3g of sodium metal is burned completely in oxygen of air.
(Na =23, O =16, at STP : 32g of O2 has 22.4L)
Find mass of the obtained oxide?
Find volume of the required air?
Answer:
mass of Na2O= 3.1 grams
volume of O2= 0.56 L
Explanation:
First what you need to do is establish the balanced equation for the reaction that they're giving you. In this case would be:
4Na + O2 > 2Na2O
And then, you can read the stequiometry of the reaction:
4 moles of Na react with one mole of oxygen to produce 2 moles of sodium oxide.
So now you know that you have 2.3 grams of sodium so you have to obtain the quantity of moles that are present in 2.3 grams of sodium. The molar mass the (the grams by which you will have exactly one mole) so all you have to do is divide 2.3g ÷ 23g/mol= 0.1 mol
So here you have 0.1 mol of sodium, and you know for a fact that for each 4 moles of sodium, one mole of oxygen reacts, so you simply divide the quantity of moles of sodium you have by the 4 moles of oxygen present in the balanced equation.
0.1 moles ÷ 4 moles = 0.025.
So for each 0.1 moles of sodium that react, 0.025 moles of Oxygen react.
Now what you need to do is to find the limitant reactor (the reactor that's according to the comparison to the balanced equation is in a smaller ratio to the other element, that would be in excess.
In this case, both elements are in a ratio that respects the balanced equation so neither of them is in excess or is limitant.
Now, to determine the amount of Na2O, you simply know that one mole of oxygen react to produce to moles of sodium oxide, So all you have to do is establish the factor of conversion:
0.025 moles O2 x 2 moles Na2O/ 1 mol O2= 0.05 moles of Na2O
Then you convert that to grams by multiplying 0.05 by the molar mass of Sodium oxide and it will be:
0.05 mol Na2O x 62 g/mol= 3.1 grams of Na2O
Now what you need to do is find the volume by which O2 is reacting in the reaction so you can use the equation of the ideal gas law.
PV=nRT at standard temperature and pressure (273 K and 1 Atm)
P=Pressure
V=Volume
n=Number of atoms
R=constant of gases (0.082 Atm L/ mol K)
T=Temperature
V=nRT/P (because you need to find the volume)
V= (0.025 mol)(0.082)(273 K)/1 atm
V=0.56 L
And there you go :)
Nitrogen and oxygen can be separated from liquid air.State the name of this process.
Explanation:
Because of the earth and climate change the point of incidence mean that you mean by engineers to social evils activities.
What is the mass number (A) of an atom that has an atomic number (Z=26) with 29 neutrons and 26 electrons?
Atom information–
Atomic number (Z) = 26Protons (p⁺) = 26Neutrons (n⁰) = 29Electrons (e⁻) = 26The atomic number (Z) of an atom is the number of protons (p⁺) it hasThe mass number (A) of an atom is characterized by the sum of the amount of protons (p⁺) with its neutrons (n⁰)Substituting values –
[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf A=p^{+}+n^{0}[/tex]
[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf A=26+29[/tex]
[tex]\qquad[/tex] [tex]\twoheadrightarrow\bf A=55[/tex]
____________________________________________
What is the noble gas notation of Titanium in the ground state?
Formulate a hypothesis based on something recently observed.
And How could this hypothesis be tested?
Answer:
If garlic repels fleas, then a dog that is given garlic every day will not get fleas. Bacterial growth may be affected by moisture levels in the air. If sugar causes cavities, then people who eat a lot of candy may be more prone to cavities.
Explanation:
A nuclear _ is a large chamber where fuel rods are located
The answer is going to be a nuclear reactor
how much percent of water should we add to sea water to change concentration from 3 to 2
Answer:
10 kg of water was added to the 20 kg of seawater to dilute it from 3% to 2%. Hope this helps!!!!!!
a sample osoxooso sixisoxoso
Answer:
I believe the correct answer is A.
Explanation:
He atoms are smaller than Ne atoms (4AMU vs 20AMU). Although the kinetic energy and concentrations are the same (same temperature and each have 0.5 mole in 10.0L containers), the kinetic energy is a product of mass and velocity. Since the Ne mass is greater, it will have a lower speed, thus taking longer to bounce out the pinhole.
5. What is a chemical equation? What are the essentials of a chemical equation? What information is conveyed by a chemical equation? What are its limitations and how are they removed?
Answer:
A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formula. (i) It must refer to an actual chemical reaction. (ii) It should be molecular. For example, H, O, N should be written as H2, O2, N2. (iii) It should be balanced and conform to the law of conservation of matter.A chemical equation conveys both qualitative and quantitative information. Qualitatively, a chemical equation tells the names of the various reactants and the products.
explain why nitrogen diffuses faster than clorine
PLEASE HELP
When an electron in a hydrogen atom drops from the fifth energy level to the second energy level 4.58 x 10-19 J of energy is released What is the frequency of the photon that is produced?
Answer:
e=hf conversion
hope it helps! stay safe as always!
Look at the diagram below. What type of bond does it show?
Explanation:
it shows covalent bonds
The type of bond the diagram shows is covalent bond. As shown the sharing of electrons in the diagram.
What are bonds?Bonds are defined as any of the interactions that lead to atoms joining together to form molecules, ions, crystals, and other stable species that make up the familiar materials found in everyday life. The ability to build molecules is made possible by a chemical bond, which is a strong attraction between atoms, ions, or molecules. Chemical bonds that hold molecules together also form temporary connections vital for life.
Covalent bond are defined as a type of chemical link where atoms share electrons to create electron pairs. Low melting and boiling temperatures, low vaporization heat, low water solubility, and poor conductivity are four characteristics of covalent compounds.
Thus, the type of bond the diagram shows is covalent bond. As shown the sharing of electrons in the diagram.
To learn more about bonds, refer to the link below:
https://brainly.com/question/13559044
#SPJ2
Helppppp asaapppppp plzzzzzz
Answer:
Alright the very first thing you need to do is balance the equation:
2HCl + Na2CO3 -----> 2NaCl + CO2 + H2O
Now we need to find the limiting reactant by converting the volume to moles of both HCl and Na2CO3.
Volume x Concentration/molarity = moles
0.235L x 0.6 M = 0.141 moles / molar ratio of 2 = 0.0705 moles of HCl
0.094L x 0.75 M = 0.0705 moles /molar ratio of 1 = 0.0705 moles of Na2CO3
Since both of the moles are equal, it means the entire reaction is complete (while the identification of limiting reactant may seem like an unnecessary step, it's quite essential in stoichiometry, so keep an eye out) and there is no excess of any reactant.
Now we know that the product we want to calculate is aqueous so, following the law of conservation of mass, we should add both volumes together to calculate how much volume we could get for NaCl.
0.235 + 0.094 = 0.329L of NaCl
Now we apply the C1V1 = C2V2 equation using the concentration and volume of Na2CO3 because it's molar ratio is one to one to NaCl (You can also use HCL, but you have to divide their moles by 2 for the molar ratio) and the volume we just calculated for NaCl.
(0.75M) x (0.094L) = C2 x (0.329L)
Rearrange equation to solve for C2:
(0.75M) x (0.094L) = C2
(0.329L)
C2 = 0.214 M (Rounded)
When the reaction is finished, the NaCl solution will have a molarity concentration of 0.214 M.
What is the final concentration (M) of a solution prepared by diluting 50.0 mL of a solution to a volume of
nomenclature of this compound
Answer:
Nomenclature is the process of naming chemical compounds with different names so that they can be easily identified as separate chemicals. Inorganic compounds are compounds that do not deal with the formation of carbohydrates, or simply all other compounds that do not fit into the description of an organic compound.
Explanation:
How many moles are in 1.93 x 10^24 atoms of gold
Answer:
We know that 1 mole equals to 6.02 x 10^23 atoms (which is Avogadro's number), so to get to atoms from moles, you would divide the atoms of gold by Avogadro's number
(1.93 x 10^24) / (6.02 x 10^23)
= 3.2 mol of gold (rounded)
It measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 3.21 moles of gold are in 1.93 x 10²⁴atoms of gold.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. Mole is directly proportional to the given number of atoms.
Given number of atoms of gold= 1.93 x 10²⁴atoms
we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mole of gold =given number of atoms of gold ÷ 6.022×10²³(Avogadro number)
Substituting all the given values, we get
Mole of gold = 1.93 x 10²⁴atoms ÷ 6.022×10²³(Avogadro number)
Moles of gold=3.21 moles of gold
Therefore, 3.21 moles of gold are in 1.93 x 10²⁴atoms of gold.
To know more about mole, here:
https://brainly.com/question/15209553
#SPJ2
15 POINTS AND BRAINLIEST
Martin hooked up the following circuit. He noticed that the light did not turn on. How could he fix the circuit to make it work?
A. Martin needs to have one wire coming from one side of the battery to the light bulb and one wire coming from the other side to the switch. To make a closed circuit, he can use a wire to connect the switch to the light bulb.
B. Martin needs to connect one wire from the switch to the battery and one wire from the battery to the light bulb. When he does this, it will be a closed circuit that allows electricity to flow.
C. Martin needs to turn the battery around. When he does this, it will become a closed circuit allowing electricity to flow through the circuit in a loop.
D. The switch is in the open position. If Martin lifts the switch, it will close the circuit and electricity will flow from the battery to the light bulb in a loop.
Question 17(Multiple Choice Worth 2 points)
(07.01 MC)
Answer: maybe D sorry if it's wrong
Explanation:
Sleet forms directly from which type of precipitation?
Sleet is a type of precipitation that is formed by water and snow that is usually partially molten.
What is sleet?
Sleet consists of icy raindrops that hit the surface, that is, part of the precipitation is frozen and the other forms water droplets.
Characteristics of sleet precipitation
The term precipitation refers to water in any form that falls from the sky, sleet is a kind of solid precipitation that occurs at some stage in winter.
Sleet is formed by freezing raindrops or partially melted snowflakes as they fall through a layer of cold air.
Therefore, we can conclude that sleet is a form of winter precipitation, in which rain and snow occur at the same time.
Learn more about sleet here: https://brainly.com/question/25414642
Answer: C) Rain droplets
Explanation: Trust me.
good and bad effects of changes in materials in the environment
Answer:
Composting, recycling, technological development, water cycle and photosynthesis are changes that have good effects. Some changes have bad effect like pollution and destruction of habitat and lose of lives.
Explanation:
hope it helps
1. SEP Developing and Using Models Look at the data in the table. Construct a
graph of the atomic numbers versus melting point temperature. Plot each group
using a different color or symbol so that you can tell them apart. Remember to
assess the range of the data before deciding on the scale for each axis.
Answer: do you syill need help on it i am happy to help
Explanation: TELL ME