Which of the following solution will have pH closer to 1.0 ?

Options

A. 100 ml of (M/ to ) HCl +100 ml of (M/10) NaOH
B. 55 ml of (M/to) HCl +45ml of (M/10) NaOH
C. 10 ml of (M/10)HCl+90 ml of (M/10) NaOH
D. 75 ml of (M/5) HCl +25ml of (M/5) NaOH

Answer

D

Explanation

` N_aV_a =(1)/(5) xx 75 =15 ,N_bV_b =(1)/(5) xx 25 =5`
if `N_aV_agt N_bV_b`
` [H^(+)] =(N_aV_a- N_bV_b)/(V_a+V_b) =(15-5)/(100) =0.1 therefore pH =1`