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why is it unnecessary to calibrate pipet when standardizing NaOH? the experiment procedure: We first drop...

why is it unnecessary to calibrate pipet when standardizing NaOH?

the experiment procedure: We first drop two drops of approximately 0.1M NaOH, and we add one drop of BTB indicator. This addition allows seeing when our titration has come to its endpoint. We are going to titrate the solution with 0.1M HCl by adding it one drop by one drop to the same well. As we reach the endpoint, the color changes to yellow.

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Calibration of any measuring item is necessary when we need to get the accurate readings (in this case volume dispensing from the pipette) from the item.

Since volume is measured in the unit of drops in the present situation (number of drops), and not in mL, therefore the calibration of the pipette is not necessary.

Also the volume unit appears on both side of the formula of equivalence point a shown below, hence will cancel out, as long as they are in same unit, e.g. drops, mL, L etc.

MHCl .VHCl = MNaOH.VNaOH

Only precaution to be taken is to count the drops accurately.

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