1. If it weighs less after heating (to something like 105 degrees C---not higher than that) than before heating, then a hydrate is a very strong possibility.
2. For the formula of the hydrate you need more information. Such as the mass after heating or some way to get at that information.
3. The drying agent and the indicator (the cobalt salt) are losing water.
how do you know if a solid can be a hydrat given the mass before and after heating?
if a solid before heating has a molar mass of 208 g/mol and a formula of XY, what is the formula of the hydrate?
some cracker tins include a glass vial of drying material in the lid. this is often a mixture of magnesium sulfate and cobalt chloride indicator. as the magnesium sulfate abdorbs moisture(MgSO4 X 1H2O - MgSO4 X 7H2O), the indicator changes color from blue to pink (CoCL2 X 4H2O - CoCl2 X 6H2O). when this drying mixture becomes totally pink, it can be restored by heating in the oven. what 2 changes are caused by the heating?
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