Question

Which of the following will decreases the pH of a 50 ml solution of 0.01 M HCl
A. Addition of 5 ml of 1 M HCL
B. Addition of 50 ml of 0.01 M HCl
C. Addition of 50 mL of 0.002 M HCl
D. Addition of Mg

Answer 1

Correct Answer - A
Addition of 5ml of 1M HCl will decrease the pH, because only this will increase the `H^(+)` ion concentration in the solution.