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CHAPTER 5
Water and Solution
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WATER AND SOLUTION
5.1 Physical characteristic of water
5.2 Composition of water
5.3 Evaporation of water
5.4 Solution and solubility
5.5 Acid and alkali
5.6 Water purification
5.7 Water supply system
5.8 Water quality
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5.5 Acid and Alkali
Properties of acid and alkali
Neutralisation
Uses of neutralisation
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SOUR taste BITTER taste
pH LESS than 7 pH MORE than 7
Litmus paper
change fromBLUE
toRED
Litmus paper
change fromRED to
BLUE
ACID + ALKALI SALT + WATER
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ACID AND ALKALI INEVERYDAY LIFE
ACID SUBSTANCES???
ORANGE, VINEGAR, ANYTHING HAVE SOURTASTE OR pH LESS THAN 7
ALKALINE SUBSTANCES???
TOOTHPASTE, SOAP, ANYTHING HAVE SOAPY
AND BITTER TASTE OR pH MORE THAN 7
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ACID + ALKALI SALT + WATER
TOOTHPASTE IS ALKALINE. IT WILLNEUTRALISE THE ACID PRODUCED BY
BACTERIA IN MOUTH
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