# Chem

posted by .

An analysis of generic antacid tablets labeled to contain 250mg of CaCO3 (MM= 100.09g/mol) per tablet of active ingredient was performed. The analysis was performed by dissolving a 0.550g sample of the antacid tablet in 75.00mL of 0.1055M HCl. The excess acid was back-titrated with exactly 44.97mL of 0.125M NaOH. The average weight of a tablet is 1.045g. The tablet came from a bottle of 125 tablets that cost \$3.49.
Calculate the actual mg per tablet of CaCO3 in the generic antacid.

• Chem -

I will estimate all of the numbers which means you must recalculate all of them for better accuracy.
millimols HCl added initially = mL x M = about 7.9 millimols HCl.
millimols NaOH to backtitrate = mL x M = about 5.6 millimoles.
millimoles HCl used by the tablet when disolved = 7.9-5.6 = about 2.3.
CaCO3 + 2HCl ==> CaCl2 + CO2 + H2O
Convert 2.3 millimoles HCl to millimoles CaCO3 so 2.3/2 = 1.2 millimoles CaCO3 in the sample or about 0.0012 mols.
g CaCO3 = mols CaCO3 x molar mass CaCO3 and that x 1000 = about 120mg CaCO3 in the 0.550 g sample. Convert to mg in a single table with the average weight of 1.045 by about 120 mg x (1.045/0.550) = ?
Post your work if you get stuck.

## Similar Questions

1. ### Chemistry

Each Rolaids tablet contains .550 g of calcium carbonate and .110 g of magnesium hydroxide. Kroger Extra Strength antacid tablets contain .750 g of calcium cabonate per tablet. What is the neutralizing ability per gram for each tablet …
2. ### Chemistry

The active ingredient of the antacid is CaCO3 and so Sally chose titration with HCl as a method for analysis. What is the mass (in g) of the CaCO3 in the sample of antacid, if it is titrated by 21.2 mL of HCl solution with concentration …
3. ### CHEMISTRY

ANTACID TABLET OF WEIGHT 1.3183G WAS DISSOLVED IN 75 MLOF CONC. HCl OF 0.1807M IS TITRATED WITH 20.36ML OF CONC. NaOH OF 0.1481M . FIND MILIMOLES OF HCl ADDED, FIND MILIMOLES OF NaOH USED IN TITRATION, FIND MILIMOLES OF HCl THAT DID …
4. ### chem1151

please me solve During an experiment to measure the efficacy of an antacid tablet, an antacid tablet was dissolved in deionized water. Then 75.0 milliliters of 0.268 M HCl solution were added to the flask containing the dissolved tablet. …
5. ### Chem 1212

An antacid tablet containing calcium carbonate as an active ingredient required 9.19 mL of 0.0956 M H2SO4 for complete neutralization. The mass of the tablet was 0.193 g. What percent of calcium carbonate was in the tablet?
6. ### Chemistry

4. A 5.309 g antacid tablet, with CaCO3 as the active ingredient, was mixed was 30.0 mL of 0.831 M HCl. It took 15.3 mL of 0.7034 M NaOH to neutralize the excess acid. a) Calculate the volume of HCl neutralized by the NaOH. b) Calculate …
7. ### Chemistry

Some antacid tablets actually contain a mixture of calcium carbonate and magnesium hydroxide (though they usually have the same “strength” as those that only contain CaCO3). If this had been the case for the antacid you tested, …
8. ### chem

Different manufacturers claim to have the best antacid. Which of the following tablets would neutralize the most acid for the money?
9. ### chem - help!

Different manufacturers claim to have the best antacid. Which of the following tablets would neutralize the most acid for the money?
10. ### chemistry

A 5.309 g antacid tablet, with CaCO3 as the active ingredient, was mixed was 30.0 mL of 0.831 M HCl. After the reaction occurred, it took 15.3 mL of 0.7034 M NaOH to neutralize the excess acid. a) How much HCl (in mL) of was neutralized …

More Similar Questions