A 1.000 g antacid tablet containing an unknown amount of carbonate ion is dissolved…
CHEMISTRY · Subjective · A Level · Chemistry · Acids and bases · Acids and bases
Problem
A 1.000 g antacid tablet containing an unknown amount of carbonate ion is dissolved in 20.00 mL of 1.000 M HCl. After the reaction is complete, the excess acid requires 18.60 mL of 0.500 M NaOH for titration. The relevant net ionic equations are
CO₃²⁻(aq) + 2 H⁺(aq) → H₂O(l) + CO₂(g)
H⁺(aq) + OH⁻(aq) → H₂O(l)
Calculate the mass, in grams, of Na₂CO₃ originally present in the tablet.