A laboratory technician transfers 25.00 mL of an unknown NaOH solution to a…
CHEMISTRY · Multi-part · A Level · Chemistry · Acids and bases · Acids and bases
Problem
A laboratory technician transfers 25.00 mL of an unknown NaOH solution to a volumetric flask and dilutes it to a final volume of 250.0 mL with distilled water. The pH of the diluted solution is found to be 12.70 at 25 °C.
(a) Calculate the molar concentration of NaOH in the diluted (250.0 mL) solution.
(b) Determine the molar concentration of NaOH in the original 25.00 mL sample before dilution.
(c) Calculate the mass of NaOH (in grams) that was present in the original 25.00 mL aliquot.