Question

Part E Given that the antacid milk of magnesia contains 400. mg of Mg(OH)2 per teaspoon, calculate the number of milliliters of stomach acid that are neutralized by 1 tablespoon of milk of magnesia. (1 tablespoon 3 teaspoons.) Express the volume in millilite rs to two significant figures. ANSWER: V = mL

Answer 1

Part - Ei The balanced neutralisation neac- tion between Mg(OH)2 and stomach acid (HU) can be given as - Mg (ont) + 2 Hu n g q + Hgo I mol Mg(ont), is required to neut- realize 2 mol of stomach acid- Given 1 tablespoon = 3 teaspoon mass of Mg(OH)2 = 3 x 400 mg a = 1200 mg = 12 g molar mars of Mg (0)2 = 58.3 g/mol No. of moles of Mg (ost? 1-2 g - 58.3 Almol = 0.02 mol 0.02 mol of Mg(OH), will completely neutralize 0.02x2 mol of her F 0.04 mol of the

Now it is assumed that the molar concentration of stomach acid is noughly = 160 mm = 0.16 M = 0.16 mol/L in 0.04 mol of a stomach acid 0.04 mol 0.16 mol/L = 0.25 L = 250 mL =0:25 x 100 ml two significant Thus, figures = 0.25 x 103 mL Aus