ACKNOWLEDGEMENT:
Figure
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Source of Figure
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Figure 12a
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mubychem.com
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Figure 12b
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www.zincyuanda.com
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Test for presence of
water:
Presence of water can be detected using white anhydrous
copper sulphate. Water turns the colour of anhydrous copper sulphate from white
to blue.
Figure 12a: Anhydrous Copper Sulphate
This is because anhydrous copper sulpahte crystals do not
contain the water of crystallization and thus appear white in colour. In the
presence of water/moisture, these crystals absorb the water and convert to
their hydrated form, which is blue in colour.
Figure 12b: Hydrated Copper Sulphate
It is important to note that, this water of crystallization
does not dissolve the crystals. It is just absorbed by the crystals and the
water molecules become associated with the crystals and is important for their
proper shape and structure.
If these hydrated crystals are heated, they will lose their
water of crystallization due to evaporation and will become anhydrous and white
in colour.
