Chemistry-T8

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  • Created on: 01-04-18 20:21
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  • Chemistry-T8
    • Acids, alkalis and indicators
      • Acids
        • A pH less than 7.
        • A source of hydrogen ions (H+), the higher the concentration of these the lower the pH.
      • Alkalis
        • A pH more than 7
        • A source of hydroxide ions (OH-). The higher the concentration of these the higher the pH
      • Indicator
        • Litmus :         in alkali - blue  in acid - red
        • Methyl orange: in alkali - yellow in acid - red
        • Phenolpthaline: in alkali - pink in acid  - colourless
    • Acids
      • A concentrated solution contains more solute per unit volume than a dilute solution.
      • If the concentration of hydrogen ions is increased by a factor of 10 the pH decreases by 1
      • Strong acids molecules dissociate completely and weak acids do not dissociate completely
    • Bases and Salts
      • Bases are substances that neutralise acids to form a salt and water
        • metal oixide + acid --> salt + water
      • An alkali is a soluble base
      • metal + acid --> salt + hydrogen
      • metal carbonate + acid --> acid + salt + water + carbon dioxide
      • acid + alkali --> salt + water
        • sodium hydroxide + hydrochloric acid --> sodium chloride + water
    • Titration
      • Flash card

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