Q:

How much water and NaOH is needed to make a pH of 11.0?

A:

Quick Answer

The ratio of NaOH to water will need to be about 0.001 moles of NaOH to 1 liter of water. Since the molar mass of NaOH is 39.9971 grams per mole, this is equivalent to 0.0399971 grams of NaOH, or about 0.04 grams.

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Full Answer

The pOH of a solution at room temperature is given by the concentration of hydroxide ions, or OH- ions, in the solution. A solution of NaOH with a concentration of 0.001 mol/L has a pOH of about 3 since NaOH almost completely dissociates into its constituent ions in aqueous solution. The pH of the solution at room temperature is then obtained by subtracting the pOH from 14, giving 11 in this case.

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