Question

An aqueous solution of perchloric acid is standardized by titration with a 0.136 M solution of barium hydroxide.

If 26.8 mL of base are required to neutralize 20.2 mL of the acid, what is the molarity of the perchloric acid solution?

_________M perchloric acid

Answer 1

2HClO4 + Ba(OH)2 ----> Ba(ClO4)2 + 2H2O

HClO4                              Ba(OH)2

M1 = ?                            M2= 0.136

V1 = 20.2 mL                 V2 = 26.8

n1 = 2                             n2 = 1

M1V1/n1 = M2V2/n2

M1 = M2V2*n1/V1n2

     = (0.136*26.8*2)/(20.2*1)

    = 0.36 M