Question

The pH of a sample of vinegar is 3.76. The concentration of hydrogen ion in it is:

• A. $1.738\times {10}^{-4}M$
• B. $1.738\times {10}^{-3}M$
• C. $1.738\times {10}^{-2}M$
• D. $1.738\times {10}^{-1}M$

Answer 1

The correct option is A $1.738\times {10}^{-4}M$

$pH=3.76=-log\left[H^{+}\right]$
$log\left[H^{+}\right]=-3.76$
$\left[H^{+}\right]=antilog\overline{4}.24$
$\left[H^{+}\right]=1.738\times {10}^{-4}M$