Question

The titration of 23.30 mL of HCl solution of unknown concentration requires 13.00 mL of a 0.200 M NaOH solution to reach the equivalence point. What is the concentration of the unknown HCl solution in M?

Express your answer in moles per liter to three significant figures.

M(HCl)M(HCl) =

_____________

Answer 1

C1V1 (HCl) =C2V2 (NaOH)

C1 X 23.30 mL = 0.200 M X 13.00 mL

C1 = (0.200 M X 13.00 mL) / 23.30 mL

C1= 0.111 M = 0.111 mol/L

concentration of the unknown HCl solution = 0.111 mol/L