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Date: 24-4-2017
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Date: 18-7-2017
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Preparation of Crucibles
A crucible used to convert a precipitate to a form suitable for weighing must maintain—within the limits of experimental error a constant mass throughout drying or ignition.
The crucible is first cleaned thoroughly (filtering crucibles are conveniently cleaned by backwashing on a filtration train) and then subjected to the same regimen of heating and cooling as that required for the precipitate. This process is repeated until constant mass has been achieved, that is, until consecutive weighings differ by 0.3 mg or less.
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4 أسباب تجعلك تضيف الزنجبيل إلى طعامك.. تعرف عليها
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