Use the formula pH = −log[H^+]

9.. The hydrogen ion concentration of a substance is 4.3*10^-6 × moles per liter.Find the pH.
Round to the nearest tenth.

10. Find the hydrogen ion concentration of a solution whose pH is 5.3.

1 answer

-log 4.3*10^-6 = -log 4.3 + -log 10^-6
= 6 -.633 = 5.37 = 5.4

-5.4 = log H+
10^-5.4 = H+ = 10^-5 * 10^-.4
= .398 * 10^-5
= 3.98 * 10^-6