Find the pH of solution prepared by mixing 25 ml of a 0.5 M solution of HCl , 10 ml of a 0.5 M solution of NaOH, and 15 ml of water.

Question

Find the pH of solution prepared by mixing 25 ml of a 0.5 M solution of HCl , 10 ml of a 0.5 M solution of NaOH, and 15 ml of water. (A) 0.8239 (B) 1.0029 (C) 1.0239 (D) 1.8239

Tardigrade Admin · Accepted Answer

We know that for HCl and NaOH, m.e. = milli equivalent ∴ m.e. of HCl=0.5 × 25=12.5 m.e. of NaOH =0.5 × 10=5.0 m.e. of HCl in the resultant mixture =12.5-5.0=7.5 Total volume = (25 + 10 + 15) ml = 50 ml ∴ Normality of HCl =( text m.e. / text Vol (ml) )=(7.50/50) ∴ Molarity =(7.50/50) ∴ [ H +]=[ HCl ]=(7.50/50) ∴ pH =- log (7.50/50)=0.8239

Q. Find the pH of solution prepared by mixing 25ml of a 0.5M solution of HCl,10ml of a0.5M solution of NaOH, and 15ml of water.

0.8239

1.0029

1.0239

1.8239

Q. Find the $p H$ of solution prepared by mixing $25 m l$ of a $0.5 M$ solution of $H Cl, 10 m l$ of $a 0.5 M$ solution of $N a O H$ , and $15 m l$ of water.