A 1.00 liter solution contains 0.40 moles hydrofluoric acid and 0.31 moles sodiu

Question

A 1.00 liter solution contains 0.40 moles hydrofluoric acid and 0.31 moles sodium fluoride.

If 0.15 moles of perchloric acid are added to this system,
indicate whether the following statements are TRUE (T) or FALSE (F).

(Assume that the volume does not change upon the addition of perchloric acid.)

A. The number of moles of HF will remain the same.

B. The number of moles of F- will increase.

C. The equilibrium concentration of H3O+ will increase.

D. The pH will decrease.

E. The ratio of [HF] / [F-] will remain the same

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A 1.00 liter solution contains 0.35 M ammonia and 0.46 M ammonium chloride.

If 0.23 moles of sodium hydroxide are added to this system,
indicate whether the following statements are TRUE (T) or FALSE (F).

(Assume that the volume does not change upon the addition of sodium hydroxide.)

A. The number of moles of of NH3 will increase.

B. The number of moles of of NH4+ will increase.

C. The equilibrium concentration of H3O+ will remain the same.

D. The pH will increase.

E. The ratio of [NH3] / [NH4+] will remain the same.

Explanation / Answer

1.
A. The number of moles of HF will remain the same. False

B. The number of moles of F- will increase. False

C. The equilibrium concentration of H3O+ will increase. True

D. The pH will decrease. True

E. The ratio of [HF] / [F-] will remain the same false

2.
A. The number of moles of of NH3 will increase. True

B. The number of moles of of NH4+ will increase. False

C. The equilibrium concentration of H3O+ will remain the same. false

D. The pH will increase. True

E. The ratio of [NH3] / [NH4+] will remain the same. false

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