Question

If 14.50 mL of 0.25 M sodium hydroxide reacts completely with 25.0 mL of hydrochloric acid, what is the concentration of the hydrochloric acid?

Answer 1

Answer: The concentration of the hydrochloric acid is 0.145 M.

Explanation: $HCl+NaOH\rightarrow NaOH+H_2O$

According to given balanced equation, 1mole of HCL require 1 mole of NaOH.

Using Molarity equation:

$M_1V_1=M_2V_2$

$M_1$ = Molarity of base= 0.25 M

$V_1$ = volume of base= 14.50 ml

$M_2$ = Molarity of acid = ? M

$V_2$ = volume of acid = 25 ml

$0.25\times 14.50=M_2\times 25$

$M_2=0.145M$