9.54. What is meant by hard water? How come boiling remove the temporary hardness of water?
9.54. What is meant by hard water? How come boiling remove the temporary hardness of water?
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1 Answer
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9.54. Water which does not produce lathers with soap is known as hard water. Hardness is due to the presence of bicarbonates, sulphates and chlorides of Ca2+ and Mg2+.
On boiling, the bicarbonates of calcium and magnesium decompose to insoluble carbonate which can be removed by filtration.
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H2S has minimum boiling point.
PbS + 4H2O2->PbSO4 + 4H2O.
Volume strength of H2O2 = Molarity * 11.2
HF molecules are associated with strong intermolecular hydrogen bonding hence its boiling point is the highest
Compound Melting Point (K)
HF 190
HCl 159
HBr 185
HI
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