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
Leno4ka [110]
3 years ago
7

When you exercise, the burning sensation that sometimes occurs in your muscles represents the buildup of lactic acid (HC3H5O3).

In a .20M aqueous solution, lactic acid is 2.6% dissociated. What is the value of Ka for this acid?
A.) 4.3x10^-6
B.) 8.3x10^-5
C.) 1.4x10^-4
D.) 5.2x10^-3
Chemistry
1 answer:
xenn [34]3 years ago
5 0

Answer:

The Ka for this acid is 1.4 * 10^-4 (option C)

Explanation:

Step 1: Data given

In a 0.20M aqueous solution, lactic acid is 2.6% dissociated.

Step 2: The equation for the dissociation of HAc is:

HAc ⇌ H+ + Ac¯

The Ka expression is:

Ka = ([H+] [Ac¯]) / [HAc]

1) [H+] using the concentration and the percent dissociation:

(0.026) (0.2) = 0.0052 M

2) Calculate [Ac-] and [H+]

[Ac¯] = [H+] = x = 0.0052 M

3) Calculate [HAc]

[HAc] = 0.20M - x ( since x << 0.20, we can assume [HAc]  = 0.20 M

4) Calculate Ka

Ka= [( 0.0052) ( 0.0052)] / 0.20

Ka = 0.0001352 = 1.4 * 10^-4

The Ka for this acid is 1.4 * 10^-4

You might be interested in
How does the concentration of a gas in solution change when the partial pressure of the gas above the solution increases?
irakobra [83]
Because the concentration of molecules in the gas phase increases with increasing pressure, the concentration of dissolved gas molecules in the solution at equilibrium is also higher at higher pressures
5 0
3 years ago
What happens to the potential energy of a book that is dropped from a desk to the floor?
Debora [2.8K]

Answer:

D.   It is converted into kinetic energy.

Explanation:

When a book is dropped from a desk to the floor, the potential energy of the book is converted to kinetic energy as it falls.

  • Potential energy of a body is the energy due to the position of the body.
  • At a particular height, the potential energy is maximum.
  • A body with mass and moving with velocity will have kinetic energy
  • As the book drops through the height, to conserve energy, the potential energy is converted to kinetic energy.
4 0
3 years ago
Porque una mezcla tiene composición variable?
LuckyWell [14K]
¿ cuál es la pregunta que intentas hacer?
7 0
3 years ago
Which of the following is true of the energy levels of electrons in shells?
anyanavicka [17]

Answer:

Option C is the correct. Valence electrons have a higher energy level than those in other filled shells

Explanation:

Electrons must lose energy to move from the first to the second shell. FALSE

The electrons always win energy to move from the first to the second shell.

All the electrons in an atom have similar energy levels FALSE.

They are not neccesary similar. In hydrogen these are the level energy -13.6 eV , -3.4 eV , -1.51 eV , -85 eV  and -54 eV

Electrons do not have potential energy, just kinetic energy. FALSE

They have both.

Valencia electrons are the last electrons in the last layer. They have as much energy as possible and are responsible for forming bonds with other elements.

8 0
3 years ago
A boy inherited genes that would ordinarily allow him to grow tall.his growth is stunted as a result of poor nutrition.this is a
Brums [2.3K]
It is an example of how the boys environment affected him, making him an outlier to what should typically happen. Hope this helps!
7 0
3 years ago
Other questions:
  • If the theoretical yield of a reaction is 22.7 g and the actual yield is 21.0 g , what is the percent yield?
    15·1 answer
  • Calculate the mass in grams of each sample.
    15·1 answer
  • The isotope 65Cu2+ has how many electrons and how many protons?
    11·2 answers
  • What factors could be used to increase reaction rate? Check all that apply.
    15·2 answers
  • A puppy weight 7\18 pound and a kitten weight 4\9 pound Which weight more Explain​
    7·1 answer
  • Draw a complete structural formula and a condensed structural formula for(a) three compounds of formula C3H8O (b) five compounds
    11·1 answer
  • How is atmospheric pressure created​
    12·2 answers
  • Express 410,000 in scientific notation
    5·1 answer
  • Tendency of some minerals to break along a smooth flat surface
    11·1 answer
  • PLEASE HELP WILL GIVE BRAINLY AND 5 STARS
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!