Please help me with these Chemistry questions.

Question

For most solid solutes in solvent, what is the general trend?

a. molarity of the solution doubles

b. solubility is not affected by temperature

c. solubility increases as temperature increases

d. solubility decreases as temperature increases

How is vapor pressure of a solution affected by the addition of a nonvolatile solute?

a. The addition of solute reduces the number of solvent particles that are able to escape the liquid and go into the vapor phase.

b. The addition of the solute has no effect on the properties of the solvent; therefore, vapor pressure remains constant.

c. An increase in solute leads to an increase in the number of gas particles above the liquid, increasing the vapor pressure.

In the picture below, how would you classify nitrite (NO₂^-)?

a. acid

b. conjugate acid

c. conjugate base

d. base

Answer 1

1). In general, as the temperature increases, the solubility of most solid solutes increases

2). The addition of solute reduces the number of solvent particles that are able to escape the liquid and go into the vapor phase

3). This is a little tricky. The way the reaction is currently written, NO₂^- would be a base (it accepts H⁺ from NH₄⁺). But typically, it is considered the conjugate base of the weak acid, HNO₂.

I'm guessing the correct answer is (d), a base