A 1.00 liter solution contains 0.55 moles nitrous acid and 0.42 moles potassium

Question

A 1.00 liter solution contains 0.55 moles nitrous acid and 0.42 moles potassium nitrite.

If 0.21 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 HNO2 will remain the same.

B. The number of moles of NO2- will decrease.

C. The equilibrium concentration of H3O+ will decrease.

D. The pH will increase.

E. The ratio of [HNO2] / [NO2-] will decrease.

Explanation / Answer

A. The number of moles of HNO2 will remain the same. F

B. The number of moles of NO2- will decrease. T

C. The equilibrium concentration of H3O+ will decrease. F

D. The pH will increase. F

E. The ratio of [HNO2] / [NO2-] will decrease. F

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