Question

The equation for the pH of a substance is pH = –log[H ], where H is the concentration of hydrogen ions. What is the approximate pH of a solution if the concentration of hydrogen ions is 5. 0 × 10–4 moles per liter? 2. 7 3. 0 3. 3 3. 6.

Answer 1

The formula is pH = -log[$H^{+}$]. You are given the concentration of hydrogen ions so all you need to do is input that into the formula.

$pH=-log[H^{+}]\\\\pH=-log[5.0x10^{-4}]\\\\pH=3.30$