Q.
At $90℃$, pure water has $\left\lbrack H^{+} \right\rbrack = 10^{- 6}$ M, if 100 mL of 0.2 M HCl is added to 200 mL of 0.1 M KOH at $90℃$ then pH of the resulting solution will be
A) 7
B) 8
C) 4
D) 6
Explanation
(d)
20 M eq. of HCl reacts completely with 20 Meq. Of KOH. Hence, the final solution is neutral. Thus, at $90℃$, pH = 6
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.