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CHEMISTRY UNIT 7 - ACIDS (Basics of pH (Universal indicator is a wide…
CHEMISTRY UNIT 7 - ACIDS 
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Basics of pH
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Universal indicator is a wide range indicator using mixture of dyes gradually changing colour over board range of pH
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pH probe attached to pH meter can be used to measure pH electronically
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Reactions of Acids
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Aqueous Neutralisation reactions can be generalised to hydrogen ions reacting with hydroxide ions to form water
H+ + OH- ---> H2O
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Strong/weak acids
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Concentration = total number of dissolved acid molecules not ionised molecules (how watered down acid is, not how strong)
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Alkali
Alkali = a base that dissolves in water to form solution with pH greater that 7, alkalis form hydroxide ions(OH- ions) in water
Test to identify CO2 gas
Bubble the test gas through limewater - calcium hydroxide solution. Carbon dioxide turns limewater cloudy white.
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