Which of the following procedures, if either, is more accurate when making a 1/5

Question

Which of the following procedures, if either, is more accurate when making a 1/50 dilution of a solution? Transfer 1 mL with a pipet into a 50-mL volumetric flask. Both procedures have the same accuracy. Transfer 20 mL with a pipet into a 1-L volumetric flask. How can the accuracy of either procedure be improved? Use an Erlenmeyer flask instead of a volumetric flask. Use a graduated cylinder instead of a pipet for the transfer. Calibrate each piece of glassware. Instead of using a 1/50 dilution to make the solution, weigh out the material on a balance and transfer it directly to the volumetric flask.

Explanation / Answer

Answer

1. The correct way is to transfer 20 ml of the given solution with a pippet into a volumetric flask Then increase the volume by adding water up to 1 litre mark.

The other method of transferring 1 ml of given solution using pippet is incorrect as pippet is caliberated in a way that it can accurately measure only 20 ml.

However the accuracy of this method can be improved if graduated cylinder (which can accurately measure 1 ml )is used instead of pippet.

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