0.20 g of sodium hydroxide (NaOH) pellets are dissolved in water to make 4.5 L of solution. What is the pH of this solution? Express the pH numerically to two decimal places.

11.05( to 2 decimal places).

Explanation:

Without mincing words let's dive straight into the solution the above problem. So, we are given the following parameters which are going to help us in solving this problem;

The mass of sodium hydroxide (NaOH) pellets given = 0.20g and the volume = 4.5 L of solution.

Therefore, the concentration of the solution = number of moles/ volume.

Note that The numbers of moles = mass/molar mass= 0.20g / 40 = 0.005 moles.

Hence, the concentration of the solution = number of moles/ volume = 0.005 moles / 4.5L = 0.00111 M.

pOH = - log[ OH^-] = - log [ 0.00111] = 2.955.

Note that; pH + pOH = 14.

Therefore, pH = 14 - pOH.

pH = 14 - 2.955 = 11.045 = 11.05( to 2 decimal places).

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