Write the formula of (i) a substance which causes temporary hardness in water - Leaving Cert Chemistry - Question c - 2008
Question c
Write the formula of (i) a substance which causes temporary hardness in water. (ii) a substance which causes permanent hardness in water.
Worked Solution & Example Answer:Write the formula of (i) a substance which causes temporary hardness in water - Leaving Cert Chemistry - Question c - 2008
Step 1
(i) a substance which causes temporary hardness in water.
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Answer
A common substance that causes temporary hardness in water is Calcium Bicarbonate, which has the chemical formula:
Ca(HCO3)2.
Step 2
(ii) a substance which causes permanent hardness in water.
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Answer
A typical substance that results in permanent hardness is Calcium Sulfate, represented by the formula:
CaSO4.
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