A) cool in dessicator
B) weigh in warm conditions
C) weigh after cooling
D) blow air through it
Correct Answer: A
Solution :
(i) If we cool hot object in open or by blowing air, some mass will be lost or gained from atmosphere because the container is open. (ii) Dessicater contains dehydrating agent. During gravimetric analysis, the precipitate is obtained by filtering the solution and transfering the precipitate in crucible. The precipitate is now dried in oven at suitable temperature. Then it is cooled in dessicator to get constant accurate weight.
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