Question

1. Calculate the hydrogen ion concentration in moles per liter for each of these solutions: (a) a solution whose pH is 5.20, and (b) a solution whose hydroxide concentration is 3.7 x 10-9 M.

Answer 1

Solution.

1.

$pH = -lg[H^+]$

$[H^+] = 10^{-pH}$

$[H^+] = 6.31 \times 10^{-6} \ M$

2.

$pOH = -lg[OH^-]$

pOH = 8.43

$pH + pOH = 14$

$pH = 14 - pOH$

pH = 5.57

$[H^+] = 2.69 \times 10^{-6} \ M$

Answer:

1.

$[H^+] = 6.31 \times 10^{-6} \ M$

2.

$[H^+] = 2.69 \times 10^{-6} \ M$