C5 Precipitation

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C5 Precipitation

  1. 1. Precipitation A reaction is which a solid (precipitate) is formed.Objective: What you need to know is how towork out which chemical is the precipitate/thesolid.
  2. 2. QuestionWhen sodium carbonate solution is mixed with calcium chloride solution, a precipitate is formed. What is it? Calcium chloride
  3. 3. Step 1: Write out the word equationWhen sodium carbonate solution is mixed with calcium chloride solution, a precipitate is formed. What is it?sodium carbonate + calcium chloride  sodium chloride + calcium carbonateExplanations:When the solutions are mixed, the ions swap partner (displacement).AB + CD  AD + BC
  4. 4. Step 2: Add state symbolsWhen sodium carbonate solution is mixed with calcium chloride solution, a precipitate is formed. What is it?sodium carbonate + calcium chloride  sodium chloride + calcium carbonate (aq) (aq) (aq) (s)Explanations:Use the solubility data from the table above.• Sodium carbonate (aqueous) – soluble in water therefore will remain dissolved• Calcium carbonate (solid) – insoluble in water therefore will be seen as a solid
  5. 5. AnswerWhen sodium carbonate solution is mixed with calcium chloride solution, a precipitate is formed. What is it?sodium carbonate + calcium chloride  sodium chloride + calcium carbonate (aq) (aq) (aq) (s)The precipitate formed is calcium carbonate (white solid). Calcium chloride

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