Question

Two 30.0 mL samples, one 0.100 M HCl and the other 0.100 M HF, were titrated with 0.200 M KOH. Answer each of the following questions regarding these two titrations.

Part A.)  What is the volume of added base at the equivalence point for HCl?

Part B.)  What is the volume of added base at the equivalence point for HF?

Part C.)  Predict whether the  at the equivalence point for each titration will be acidic, basic, or neutral.

neutral for HCl, and basic for HF

neutral for HCl, and acidic for HF

neutral for HF, and acidic for HCl

neutral for HF, and basic for HCl

neutral for both

Part D.)  

Predict which titration curve will have the lower initial pH.

HF curve

HCl curve

Answer 1

Two 30.0 mL samples, one 0.100 M HCl and the other 0.100 M HF, were titrated with 0.200 M KOH. Answer each of the following questions regarding these two titrations.

Part A.)

millimoles of HCl = 30.0 x 0.100 = 3.00

At equivalence point :

mmoles of HCl = mmoles of KOH

3.00 = 0.200 x V

V = 15.0

volume of added base = 15.0 mL

Part B.)

millimoles of HF = 30.0 x 0.100 = 3.00

At equivalence point :

mmoles of HF= mmoles of KOH

V = 15.0

volume of added base = 15.0 mL

Part C.)

neutral for HCl, and basic for HF

d)

HCl curve