Chemistry waec 1992

The scum formed when soap is mixed with hard water could be

a

calcium trioxocarbonate (IV)

b

propane- 1, 2, 3 - triol

c

calcium hydrogentrioxocarbonate (IV)

d

magnesium tetraoxosulphate (IV)

e

calcium stearate

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Discussions (4)

Kingrate
7 years ago

The answer is calcium staerate because the calcium ion from the hard water forms an insoluble substance with the sodium staerate(soap).
RCOONa + Ca+2 .....> RCOO-Ca2+

Anzyumoh
3 years ago

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