Question

A 20.06-mL sample of hydrochloric acid solution requires 25.00 mL of 0.149 M sodium hydroxide for complete neutralization. What is the concentration of the original hydrochloric acid solution?

Answer 1

Answer:

The concentration of the original hydrochloric acid solution is - 0.1856 M

Explanation:

Lets calculate-:

Neutralization reaction follows dilute principle

   $(N_1)(V_1)=(N_2)(V_2)$ For titration between NaOH and HCl

  $(M_1)(V_1)_H_C_l=(M_2)(V_2)_N_a_O_H$

Putting the given values ,

    $M_1\times 20.06ml=0.149M\times25.0ml$

       $M_1_H_C_l=\frac{0.149\times25.0}{20.06}$

            = 0.1856 M

Hence , the concentration of hydrochloric acid solution is 0.1856 M.