A single dose of a certain antacid contains 250. mg of Mg(OH)2 and 300. mg of CaCO3. How many mmol of H+ can be neutralized by one dose of this antacid? Do not include units in your answer

Answer 1

Mg(OH)2 + 2H^+ ==> 2H2O + Mg^2+
mmols Mg(OH)2 = mg/molar mass = approx 250/58.3 = about 4 but that's only an estimate.

mmols H^+ = twice that approx. Again, an estimate.

CaCO3 + 2H^+ ==> 2H2O + Ca^2+
mmols CaCO3 = 300/100 = about 3
mmols H^+ = twice that.

Add mmols H^+ = total mmols H^+.