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JAMB UTME - Chemistry - 2007

Question 1 Report

When temporary hard water is boiled for sometime in a kettle, the inner surface of the kettle becomes coated with a deposit of
Answer Details
When temporary hard water is boiled for some time in a kettle, the inner surface of the kettle becomes coated with a deposit of calcium trioxocarbonate (IV). This is because temporary hard water contains soluble calcium hydrogen trioxocarbonate (IV) which decomposes upon heating to form insoluble calcium trioxocarbonate (IV) which deposits on the inner surface of the kettle. This deposit is commonly known as limescale and can be difficult to remove.
Read lesson note on Acids, Bases And Salts (Ghana Only) (WAEC)
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