Question

A) When 25 mL of 0.40 M ammonium bromide and 25 mL of 0.20 M barium hydroxide are combined, the pH of the resulting solution will be : ____

A. Less than 7
B. Equal to 7
C. Greater than 7

B) When 25.0 mL of 0.200 M hydrochloric acid and 25.0 mL of 0.200 M ammonia are combined, the pH of the resulting solution will be : ___

A. Less than 7
B. Equal to 7
C. Greater than 7

C) When 50.0 mL of 0.200 M nitric acid and 50.0 mL of 0.200 M sodium hydroxide are combined, the pH of the resulting solution will be : ___

A. Less than 7
B. Equal to 7
C. Greater than 7

Answer 1

A)

Here equal moles of H+ and oH- is being added

NH4Br is weak acid

Ba(OH)2 is strong base

So, we are mixing equal mol of strong base and weak acid.

At the end, solution will be basic and hence pH would be greater than 7

Answer: C

B)

HCl is strong acid

NH3 is weak base.

So, we are mixing equal mol of strong acid and weak base.

At the end, solution will be acidic and hence pH would be less than 7

Answer: A

C)

HNO3 is strong acid

NaOH is strong base

So, we are mixing equal mol of strong acid and strong base.

So, solution will be neutral and pH would be 7

Answer: B