Question

What is $pH$ of a solution whose $H^{+}$ ion concentration is $2\times {10}^{-5}$ ions/litre?

• A. 4.7
• B. 6.7
• C. 9.3
• D. None of these

Answer 1

The correct option is A 4.7

$pH$ of a solution = $-\log \left(H^{+}\right)$

Given, $\left[H^{+}\right]=2\times {10}^{-5}$

$⟹pH=-\log (2\times {10}^{-5})=5-\log 2=4.7$