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An unknown mass of Na₂O (molar mass = 61.979 g/mol) was dissolved in enough water to create a 100.0 mL stock solution. A 5.00 mL sample of the stock solution was transferred to a volumetric flask and diluted to 500.0 mL. The pH of the dilute solution is 13.03. - Calculate the concentration of OH⁻ ions in the dilute solution. - Calculate the concentration of OH⁻ ions in the stock solution. - Determine the original mass of Na₂O dissolved in the stock solution.
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