Question

Question 1

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.

Question 2

What step is used to break the HCO3-/CO2 buffer system during the titration with NaOH?

Stirring during the titration

Adding excess HCl then boiling

Crushing the antacid tablet

Adding phenolphthalein prior to the addition of any HCl

Question 3

A 0.500 g antacid tablet is mixed with 50.00 mL of 0.100 M HCl then boiled. After cooling, 4.90 mL of 0.100 M NaOH is required to achieve a phenolphthalein end point. Calculate the neutralizing power of the antacid tablet in terms of mmol of H+/g of antacid. Do not include units in your answer.

Question 4

If calcium carbonate is the only active ingredient in the antacid in question #3, how many mg of calcium carbonate are there in a 0.500 g tablet? Do not include units in your answer.