Question

The pH scale is a logarithmic scale corresponding to the hydronium ion concentrations of aqueous solutions. The pH is equal to the negative logarithm (base 10) of the hydronium ion concentration.

pH = -log [H_3O^+]
This can be restated in an equation for calculating the hydronium ion concentration from the pH.
[H_3O^+] = 10-pH
A solution has a pH of 9.73. What is the [H_3O^+] in the solution?

Answer 1

A solution with a pH of 9.73 has a hydronium ion concentration of approximately 1.85 × 10^-10 M, calculated using the formula [H3O+] = 10^-pH.

Step-by-step explanation:

The pH of a solution is the negative logarithm (base 10) of the hydronium ion concentration [H3O+]. A solution with a pH of 9.73 would have a hydronium ion concentration calculated using the formula [H3O+] = 10-pH. Plugging in the pH value we get [H3O+] = 10^-9.73. Using a calculator to find the power of 10 to the negative 9.73, the concentration of hydronium ions in the solution is approximately 1.85 × 10^-10 M.