4.7 describe experiments to prepare soluble salts from acids

Acid + Base (metal oxide / metal carbonate) 

  1. Fully react excess base, check the solution is neutral by indicator paper
  2. Filter to remove the excess base
  3. Heat the substance to decrease the volume of the mixture to exapourate water
  4. Allow the salt crystals to form
  5. Dry the crystals in an oven or on filter paper
  • Acid + Base –> Salt + Water (if metal carbonate, + carbon dioxide) 

Acid + Metal (redox reaction)

  1. Add excess metal to dilute acid in a beaker
  2. When no more bubbles (Hydrogen gas) are seen, filter of the excess metal
  3. Heat the filtrate (solution) in an evaporating basin
  4. Stop heating when the glass rod has crystals forming on it (saturated solution)
  5. Leave the solution to dry so that crystals can form
  • Acid + Metal –> Salt + Hydrogen

Acid + Alkali 

  1. Fill burette with acid
  2. Use pipette to add 25cm^3 of alkali into a conical flask
  3. Add 3 drops of indicator to this flask
  4. Add acid to the alkali slowly, making sure that the flask is swirled
  5. Stop when the required colour change occurs
  • Acid + alkali –> Salt + Water
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