Question

Which of the following is not a disadvantage of using hard water?

A
In production of steam in boilers
B
Formation of scales in cooking utensils
C
In cooking,bathing and washing
D
In ion exchanges
Solution
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In an ion exchange using hard water is not a disadvantage since it becomes soft by exchanging anions or cations. Na+, Ca2+ and Mg2+ ions (from water) are exchanged with H+ ions (from cation exchange resins). Cl, SO24 and NO3 ions (from water) are exchanged with OH ions (from anion exchange resins).

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