What concentration of HCl is required for pH 16 a 16 mM b 16

What concentration of HCl is required for pH 1.6? a) 1.6 mM b) 1.6 M c) 25 mM d) 250 mM

Solution

HCl is a strong acid and dissociate completely to form H+ and Cl-

[H+] = 10^-pH

[H+] = 10^1.6 = 0.0251 M

1 M = 1000 mM

0.0251 M = 25 mM

Thereore, the concentration of HCl required would be 25 mM

option C is correct