Find the pH of a solution prepared by mixing 25ml of a 0.5M solution of HCI,10ml of a 0.5M solution of NaOH and 15 ml of water :-

Options

A. 4
B. 3
C. 0. 82
D. 0. 10

Answer

C

Explanation

meq of HCI`=0.5xx25=12.5`
meq of `NaOH=0.5xx10=5`
remaning of HCI in mixture =7.5
Total volume `=25+10+15=50 mL`
`[H^(+)]=(7.5)/(50)`
pH = log `(7.5)/(50)=0.82`