Question

What will be the pH of a soft drink if hydrogen ion concentration in sample is $3.8\times {10}^{-3}$ M?

• A. $3.8$
• B. $5.04$
• C. $2.42$
• D. $9.2$

Answer 1

The correct option is C $2.42$

$pH$ is the negative log of $H^{+}$ concentration

i.e $pH=-log\left[H^{+}\right]$

$pH=-log(3.8\times {10}^{-3})=-[log3.8+log{10}^{-3}]=2.42$

Hence, option $C$ is correct.