The furring of kettles is caused by the presence of what compound in water?
- calcium tetraoxosulphate (IV)
- calcium hydrogentrioxocarbonate (IV)
- calcium hydroxide
-
calcium trioxocarbonate (IV)
The correct answer is: D
Explanation
Calcium hydrogen carbonate, often present in temporary hard water, is boiled in a kettle to remove the hardness. In the process, a scale forms on the inside of the kettle in a process known as furring of kettles. This scale is composed of calcium carbonate.
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