7.41 The concentration of hydrogen ion in a sample of soft drink is 3.8 × 10–3 M. what is its pH?

Given,
$\therefore$pH value of soft drink
$=-\mathrm{log}\left[{\mathrm{H}}^{+}\right]\phantom{\rule{0ex}{0ex}}=-\mathrm{log}\left(3.8×{10}^{-3}\right)\phantom{\rule{0ex}{0ex}}=-\mathrm{log}3.8×{10}^{-3}\phantom{\rule{0ex}{0ex}}=-\mathrm{log}3.8+3\phantom{\rule{0ex}{0ex}}=-0.58+3\phantom{\rule{0ex}{0ex}}=2.42\phantom{\rule{0ex}{0ex}}$