Question

200 mL of 0.01 M HCl is mixed with 400 mL of 0.01 M H2SO4. The pH of the mixture is ___.
[Given log 2 = 0.30, log 3 = 0. 48, log 5 = 0.70, log7 = 0.84, log 11 = 1.04.]

• A. 1.14
• B. 1.78
• C. 2.34
• D. 3.02

Answer 1

Answer: (B)

1.78

Answer 2

Molarity of resultant solution is given by
Molarity=$\frac{10}{600}$ of equivalents
[H+]=$\frac{10}{600}$
pH=−log[H+]
pH=−log[$\frac{10}{600}$]
pH=1.778
So, the correct option is (B): 1.78