Who Cares About Titration?

Titration is an analytical technique in which one can calculate the concentration of a solute in a solution, or in other words a process in which one solution is added to another solution to where it will react under conditions in which the volume can be measured. Titration is usually associated with acid-base reactions but can also involve other types of reactions as well. Why and how can titration be used to determine the concentration of anything. Concentration=molarity; molarity measures concentration. By adding a substance with a known molarity and known volume to something with an unknown molarity and known volume, it is possible to figure out the molarity of the the unknown with the following equation: (M1)(V1) = (M2)(V2).We performed a lab that required us to do exactly that. In order to know how much of the known to add, we put phenolphthalein in the unknown, it turns colorless in acidic solutions and pink in basic solutions.

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Now to determine the concentration of an antacid tablet composed of magnesium bicarbonate you have to use an acid such as Hydrochloric Acid. Now based on my understanding of titration and with help from my online sources, you can follow the steps to titrate Magnesium bicarbonate.

1. Clean, rinse, and fill a buret with HCl solution. Record the molarity of the HCl and the initial HCl volume reading from the buret .

2. Weigh the antacid tablet the and record the mass.

3. Transfer it to a clean 250 mL Erlenmeyer flask.

4. Add distilled water to the flask and swirl the flask to help dissolve the antacid. Make sure to dissolve it completely.

5. Add 3 to 4 drops of phenolphthalein indicator to the flask, and titrate the base solution to a phenolphthalein endpoint. Record the final HCl volume (+0.02 mL).

6. Repeat this analysis on two other brands of antacid tablets.

Sources:

http://www.chem.latech.edu/~deddy/chem104/104Antacid.htm

Lab Results/ Class Notes

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1 Comment

  1. Your diagram and explanation of titration made the process very clear! I enjoyed reading your blog. Try adding example equations so the readers know the complete process, instead of just how to do it. Then they know how to find it from the data they collected 🙂

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