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If the analyte is a solution, pipet the desired volume into an Erlenmeyer flask. Record the exact volume transferred. Dilute the sample with a small portion (about 10 to 20 mL) of the liquid used to prepare the solution.
If the analyte is a solid, weigh the desired mass, add the solid to an Erlenmeyer flask, and add enough liquid to completely dissolve the solid. (This dissolution step implies that the solubility properties of the solid are known before beginning the preparation of the analyte solution.) Be sure to record the exact mass of sample used.
Although other liquids can be used, distilled water is typically used to dilute or dissolve samples for a titration experiment. Consider the chemical properties of the reactants, intermediates, and products before selecting a liquid to dilute or dissolve a sample.
If an indicator solution will be used to observe the end-point, remember to add the indicator solution.
Why is an Erlenmeyer flask used as the container? Answer
IMAGE. An Erlenmeyer flask.
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Any solution that splashes onto the side of the flask should be rinsed back into the bulk solution. If any of the solution splashes out of the flask, the titration data should be discarded and another trial should be performed. An Erlenmeyer flask is designed to reduce the risk of losing solution due to splashing.
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