Question about antacids experiment?

Posted on 2015-09-26 08:44:00 in Chemistry by EMMA

What is a good method to find out the effectiveness of different brands of antacid?

The method I currently have is:
1. Crush antacid tablet (brand X) into powder with mortar and pestle and weigh it.

2. Make 60cm^3 of 0.1M HCl from a solution of 2M HCl by diluting (I used 0.1M because it resembles concentration of HCl in stomach, so should i keep it at 0.1?)

3. Pour 60cm^3 0.1M HCl into conical flask.
4. Pour the powdered antacid into the the conical flask HCl and stir.

5. Perform titration, put NaOH into burette and phenolphthlein indicator into conical flask. Titrate.

Problem with this is that the titration is so hard to control and I have no idea when to actually stop.

is there anything wrong with my method? And from the titration, how do I actually calculate the volume of HCl neutralized by the antacid?

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