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JAMB - Chemistry (1986 - No. 39)

The tabulated results below were obtained by titration 10.0 cm3 of water with soup. The titration was repeated with the same sample of water after boiling. The ratio of permanent to temporary hardness is
1.5
1.4
4.1
5.1

Uitleg

The ratio of permanent to temporary hardness will be 20:(20 - 15)

= 20:5

= 4:1

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