Question

Calculate the hydronium ion concentration, [H3O+] , for a solution with a pH of 10.68 . [H3O+]= M

Answer 1

We know that pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance which is defined as the negative base 10 logarithm of the activity of hydrogen ions. Which states -

• pH= - log [H⁺]= - log [H₃O⁺]

As per question, we are given a pH value which is 10.68 for a solution and have asked to find out the hydronium ion concentration. Since we have the value of pH, so we can put into the formula and solve for [H₃O⁺] -

`\:\:\:\:\:\:\longrightarrow \sf pH = 10.68\\`

`\:\:\:\:\:\:\longrightarrow \sf - log [H₃O⁺] = 10.68 \\`

`\:\:\:\:\:\:\longrightarrow \sf [H₃O⁺] = 10^(-10.68)\\`

`\:\:\:\:\:\:\longrightarrow \sf \underline{[H₃O⁺] = 2.0893 * 10^(-11)\:M} \\`

Therefore, the hydronium concentration for the solution is
`\underline{\: \sf 2.0893 * 10^(-11)\:M }\\`