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The crucible must be cold before weighing because the heat from the crucible will warms the surrounding air
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What is the purpose of taring the crucible before using the incineration process?
It reduces errors caused by variations in the weight of the crucible itself.Taring is accurately establishing the empty weight of the crucible, which can vary with contaminants, residue, or oxides. By repeatedly heating, cooling, and weighing the crucible, until there is only an acceptable variation between weighings, the actual weight of samples before and after incineration can be more precisely measured.
Why need to cool The Crucible by Arthur Miller before measuring?
The crucible must be weighted at a constant temperature, generally 20 oC. During an analytical determination - for example - all the weighings must be made at the same temperature. Also a hot crucible has a negative influence on the balance.
Why is a desiccator used to cool a crucible?
A desiccator is used to cool a crucible in order to prevent the absorption of moisture during the cooling process so an accurate result can be obtained
Why must the crucible be cooled before weighing?
There are a few reasons: Safety, so individual does not get burned; a hot crucible could damage the scale; hot crucible could alter the substance being weighed; a hot crucible as the heat is released into surrounding air, it causes convection air currents when using an electronic scale than measures to multiple decimal places can give a miss reading and give the individual a larger error percentage in their experiment.
During the cooling of the fired crucible water condensed on The Crucible wall before its mass measurement Will the reported percent water in the hydrated salt be reported too high or too low?
The percent of water is determined by the loss is mass after heating the water vapor condensed on the crucible wall before heating.
