1 The concentration of OH in a sample of seawater is 13106 M

1. The concentration of OH in a sample of seawater is 1.3×10⁶ M. Calculate the concentration of H3O+ ions. (Express your answer using two significant figures.)

2. Calculate the pH of each of the following solutions: A sample of seawater that has an OH concentration of 1.27×10⁶ M . (Express your answer using two decimal places.)

3. A sample of acid rain that has an H3O+ concentration of 6.1×10⁵ M . (Express your answer using two decimal places.)

Solution

1. [H⁺]*[OH^-] = 10^-14

[H⁺] = 10^-14/[OH^-]

[H⁺] = 10^-14/1.3*10^-6

[H⁺] = 7.69*10^-9M