Predicting whether a precipitate will form.


Head up homework with the date. Copy the table below into your book. Imagine mixing a solution from the left hand column with a solution from the top row. If a precipitate forms when the solutions are mixed write the name of the precipitate on the grid. If no precipitate results write “no precipitate” on the grid.
Use the solubility rules from your book or from the previous post.


The first example is done for you:

mixing copper nitrate and sodium hydroxide solutions.

step 1 write the word equation and switch the names around

copper nitrate + sodium hydroxide ——-> copper hydroxide + sodium nitrate.

Step 2 are any of the products insoluble

All hydroxides apart from sodium and potassium are water insoluble. Copper hydroxide is insoluble and a precipitate is formed.

write on the grid in the first space copper hydroxide precipitates.

Precipitation reactions

Salts and their solubility in water.

Each acid has its own family of salts.

  • Sulphuric acid produces sulphates
  • Nitric acid produces nitrates
  • Hydrochloric acid produces chlorides

Salts are very often water soluble, if you stir them in water they dissolve and go into solution. Flick through the presentation to slide 4 and use the solubility rules to do the homework exercise. You can watch a precipitation reaction after slide 5.


Put the date in your book. Copy in the list and predict whether each salt is soluble in water or insoluble. The first one is done for you

Salt                                   Soluble/Insoluble

Sodium chloride                  Soluble

Calcium nitrate

Silver chloride

Lead sulphate

calcium nitrate

magnesium chloride

magnesium hydroxide

aluminium sulphate

silver sulphate

lead chloride

calcium carbonate

sodium carbonate

aluminium carbonate

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