Why is the conical flask rinsed only with distilled water, while the pipette is rinsed with the solution it will deliver?

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Question

Why is the conical flask rinsed only with distilled water, while the pipette is rinsed with the solution it will deliver?

Accepted Answer

Water in the flask does not change the moles present, but water in the pipette would dilute the measured volume — Award 1 mark. The titre depends on the amount of substance in the flask, not on the total volume of liquid there, so extra water is harmless. Inside the pipette, water would reduce the concentration of the fixed volume actually delivered.

Answer

The pipette and the flask are made from different types of glass

Answer

Water left in the flask would destroy the indicator

Answer

Distilled water reacts with acids but not with alkalis

Answer

Water in the flask does not change the moles present, but water in the pipette would dilute the measured volume

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