1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
PIT_PIT [208]
3 years ago
15

The equilibrium concentrations of the reactants and products are [HA]=0.280 M, [H+]=4.00×10−4 M, and [A−]=4.00×10−4 M. Calculate

the value of pKa for
Chemistry
1 answer:
Tems11 [23]3 years ago
6 0

Answer:

6.24

Explanation:

The following data were obtained from the question:

Concentration of HA, [HA] = 0.280 M,

Concentration of H+, [H+] = 4×10¯⁴ M

Concentration of A-, [A−] = 4×10¯⁴ M

pKa =.?

Next, we shall write the balanced equation for the reaction. This is given below:

HA <===> H+ + A-

Next, we shall determine the equilibrium constant Ka for the reaction. This can be obtained as follow:

Equilibrium constant for a reaction is simply the ratio of concentration of the product raised to their coefficient to the concentration of the reactant raised to their coefficient.

The equilibrium constant for the above equation is given below:

Ka = [H+] [A−] /[HA]

Concentration of HA, [HA] = 0.280 M,

Concentration of H+, [H+] = 4×10¯⁴ M

Concentration of A-, [A−] = 4×10¯⁴ M

Equilibrium constant (Ka) =

Ka = (4×10¯⁴ × 4×10¯⁴) / 0.280

Ka = 1.6×10¯⁷/ 0.280

Ka = 5.71×10¯⁷

Therefore, the equilibrium constant for the reaction is 5.71×10¯⁷

Finally, we shall determine the pka for the reaction as follow:

Equilibrium constant, Ka = 5.71×10¯⁷

pKa =?

pKa = – Log Ka

pKa = – Log 5.71×10¯⁷

pKa = 6.24

Therefore, the pka for the reaction is 6.24.

You might be interested in
When is the potential energy between two atoms at zero?
ExtremeBDS [4]

Answer:

When two atoms are very far apart, the potential energy approaches zero.

8 0
3 years ago
How does a lightning rod protect a<br> building from lightning damage?
LiRa [457]

Answer:

The lightning rod attracts lightning and is not connected to any other pieces of metal that may harm any electrical circuits.

Explanation:

I hope this helps, I tried my best to explain it quickly for you.

7 0
2 years ago
Read 2 more answers
Magnesium hydroxide (Mg(OH)2): g/mol
Eva8 [605]

To determine the molar mass, you need to get the atomic mass of the molecule. To do this, check the periodic table for the atomic mass or average atomic weight of each element.

Mg = 24.305 x 1 = 24.305 amu

O = 15.9994 x 2 =31.9988 amu

H = 1.0079 x 2 = 2.0158 amu

 

Then, add all the components to get the atomic mass of the molecule.

24.305 amu + 31.9988 amu + 2.0158 amu = 58.3196 amu


The atomic mass is just equivalent to its molar mass.

So, the molar mass of Magnesium hydroxide (Mg(OH)2) is 58.3196 g/mol.

8 0
3 years ago
Read 2 more answers
Ceruloplasmin is:Multiple Choicea zinc-containing enzyme in the intestinal wall.a copper-containing enzyme that oxidizes Fe2+ to
Artemon [7]
Gatdrfshefeegdgtttrretertretdffdddgetdf drew d rheyrhsfrtgdurudhdhhhyyttyfggfhftttytertyzt
6 0
3 years ago
What is displacement reaction​
jenyasd209 [6]
A displacement reaction (also known as a replacement reaction) is when one element is replaced by another compound. Ex) Fe+CuSO4=FeSO+Cu
3 0
2 years ago
Read 2 more answers
Other questions:
  • What is the defining characteristic of an exothermic reaction.
    5·1 answer
  • 6.24 x 10^24 atoms Na to moles Na
    6·1 answer
  • What happens when a vinyl strip is rubbed with a woolen cloth, then brought near a stream of water?
    9·1 answer
  • What is it when a cup of ice turns to water
    10·2 answers
  • Which of the following options is correct?
    15·1 answer
  • Is this equation balanced and in lowest form? 4NH➡ 2N² + 6H²
    6·1 answer
  • Identify the approximate color you would expect if
    13·2 answers
  • C3H8 (g)+ 502 (g)  3CO2 (g) + 4 H2O (g) + 531 kcal
    7·1 answer
  • In science, observations are objective, but intereroes are subjective. True or False?
    10·1 answer
  • Pls help need this to pass
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!