A 1.00 liter solution contains 0.42 M ammonia and 0.32 M ammonium perchlorate .

Question

A 1.00 liter solution contains 0.42 M ammonia and 0.32 M ammonium perchlorate.

If 0.16 moles of hydroiodic 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 hydroiodic acid.)

_______TrueFalse A. The number of moles of NH3 will decrease.

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

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

_______TrueFalse D. The pH will decrease.

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

Explanation / Answer

NH3 <---> NH4+ CLO4-

When H+ is added NH3 will react with H+ to form more NH4+

So,

number of moles of NH3 will decrease.

The number of moles of NH4+ will increase.

Since we are adding acid:

The equilibrium concentration of H3O+ will increase.

The pH will decrease.

Ratio of of [NH3] / [NH4+] will decrease.

So answers are:

A. True

B. True

C. True

D. True

E. False

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