Question

The pH of a sample of bile is 7.9. What is the concentration of H ⁺ in nmol L ^-1?

126 nmol L^-1

12.6 nmol L^-1

0.126 nmol L^-1

1.26 nmol L^-1

Answer 1

pH = -log[H+]

7.9 = -log[H+]

$log[H+] = 10^{-7.9} \;M \\ = 1.26 \times 10^{-8} \; M\\ = 0.126 \times 10^{-9} \;M \\ = 0.126 \; nmol/L$