A 1.00 liter solution contains 0.50 moles hydrofluoric acid and 0.38 moles sodiu

Question

A 1.00 liter solution contains 0.50 moles hydrofluoric acid and 0.38 moles sodium fluoride .

If 0.19 moles of nitric acid are added to this system, indicate whether the following statements are true or false.

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

A. The number of moles of HF will decrease.

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

C. The equilibrium concentration of H3O+ will increase.

D. The pH will remain the same.

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

Explanation / Answer

HF (aq.) = H+ (aq.) + F- (aq.)
A.

FALSE.

Because addition HNO3 release H+ ions which combines with F- ions to form HF and hence it will increase the concentration of HF.

B.

TRUE.

Because addition HNO3 release H+ ions which combines with F- ions to form HF and hence it will decrease the concentration of F-.

C.

FALSE

Because addition HNO3 release H+ ions which combines with F- ions to form HF and hence it will decrease the concentration of H+

D.

FALSE. There slight change in pH as the new [HF]and [F-] changes slightly.

E.

FALSE

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