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QUESTION

# Calculate [H3O+] for this solution: pH = 8.85? Can you please show how the answer is 1.4×10^-9M?

This is a fairly straightforward problem, all you need to know is that

[H_3^+O] = 10^(-pH)

Plugging in the value will produce

[H_3^+O] = 10^(-8.85) = 0.00000000141 = 1.4 * 10^(-9) M

SInce the pH is greater than 7, you are dealing with a basic solution

pOH = 14 - pH = 14-8.85 = 5.15

This means the concentration of OH^- is

[OH^-] = 10^(-pOH) = 10 ^-5.51 = 7.1 * 10^-6 M