Question

A solution containing HCl and the weak acid HClO2 has a pH of 2.4. Enough KOH (aq) is added to the solution to increase the pH to 10.5. The amount of which of the following species increases as the KOH (aq) is added? A)Cl- (aq) B)H+ (aq) C)ClO2- (aq) d)HClO2 (aq)

Answer 1

Answer:

$\boxed{\rm \text{[ClO _{2}^{-} ] increases}}$

Explanation:

At the beginning, you have two reactions happening:

$\rm HCl + H _{2} O \, \longrightarrow \, H _{3} O ^{+} + Cl ^{-} \\\rm HClO _{2} + H _{2} O \, \rightleftharpoons \, H _{3} O ^{+} + ClO _{2}^{-}$

As you add KOH(aq), it does two things:

1. It increases the volume of the solution.
2. It reacts with the hydronium ions to form water.

A) The HCl is completely ionized. The Cl⁻ does not react, but it is diluted when the volume of the solution increases. [Cl⁻] decreases.

B) The KOH reacts with the H⁺ and removes it from the solution. [H⁺] decreases.

C) When all the H⁺ from the HCl has been neutralized, the KOH starts neutralizing the H⁺ from the HClO₂. According to Le Châtelier's Principle, more HClO₂ will dissociate to replace the decreased H⁺. [HClO₂] decreases.

D) As HClO₂ reacts, it forms ClO₂⁻. $\boxed{\rm \textbf{[ClO _{2}^{-} ] increases}}$

Answer 2

The amount of ClO2- increases as aqueous KOH is added.

Acids

• Acids are substances which donate hydrogen ions or protons in aqueous solutions.
• Acids can either be strong or weak.

Strong acids ionize completely in solution to produce hydrogen ions.

Weak acids only ionize partially in solution to produce hydrogen ions.

• HCl is a strong acid and ionizes completely to produce hydrogen and chloride ions.
• HClO2 is a weak acid and only ionizes partially.

When aqueous KOH is added to a mixture of HCl and HClO2, the follow occurs:

1. Hydrogen ions from HCl are removed, hence H+ reduces.
2. Cl- amount remains the same but is diluted as the volume of solution increases.
3. ClO2- increases as the hydrogen ions are removed from the partially ionized HClO2.
4. HClO2 decreases due to equilibrium shift towards formation of more H+ and ClO2-

Therefore, the amount of ClO2- increases as aqueous KOH is added.

Learn more about weak and strong acid at: https://brainly.com/question/15192126