The pH of your swimming pool is found to be 6.89. What is the concentration of H+ ions in the pool?

A. 7.76 × 106 M
B. 0.84 M
C. 1.29 × 10-7 M
D. 1.29 × 107 M

The answer is 1.29 x 10^-7 M

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To find the concentration of H+ ions in a solution based on its pH, you can use the equation:

pH = -log[H+]

First, rearrange the equation to solve for [H+]:

[H+] = 10^(-pH)

Now, substitute the given pH value of 6.89 into the equation:

[H+] = 10^(-6.89)

Using a calculator, evaluate 10^-6.89, which gives us approximately 1.29 × 10^(-7) M.

Therefore, the concentration of H+ ions in the pool is 1.29 × 10^(-7) M.

The correct answer is C. 1.29 × 10^(-7) M.

pH = -log(H^+)

Substitute and solve for H^+