A 1.00 liter solution contains 0.24 M ammonia and 0.31 M ammonium bromide . If 0

Question

A 1.00 liter solution contains 0.24 M ammonia and 0.31 M ammonium bromide.

If 0.078 moles of barium hydroxide 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 barium hydroxide.)

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

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

_______True False C. The equilibrium concentration of H3O+ will increase.

_______True False D. The pH will remain the same.

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

Thanks!

Explanation / Answer

A) True

Ba(OH)2 react with NH4+

Ba(OH)2 + 2NH4+ ---------> 2NH3 + 2H2O + Ba2+

So, no of mole of NH3 increasing

B) False

no of mole of NH4+ decrease according to the above equation

C) False

H3O+ will decrease

D) False

pH will increase

pH = pKa + log([NH3]/[NH4+])

pKa of NH4+ is 5.6 ×10^-10

E) False

[NH3]/[NH4+] will increase

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