Solublity and predicting precipitation: US 8950 final practise
Last chance to practise problems and receive feedback before the test on friday
Predicting whether a precipitate will form.
Homework.
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
Precipitates
View more PowerPoint from johnwest
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.
Homework:
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