Question

when lower meniscus is adjusted to zero mark and when upper meniscus is adjusted to zero mark?


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Answer 1

Answer:

Explanation:

Lower meniscus of liquid level is taken as zero mark for every titration because -

When a solution is taken in titrating tube, some of it sticks to the edges due to adhesive forces.

But the actual phase boundary between solution and air is defined by lower meniscus of liquid.

Hence, always take the zero mark of lower meniscus as the starting point for every titration.

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