Precipitation
- Created by: issey02
- Created on: 30-09-18 15:09
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- Precipitates
- Precipitation
- Solubility rules
- Creating salts depends on whether its soluble or not
- The product will either be a solution or a solid
- A precipitate is an insoluble solid from a solution
- Solubility rules
- Insoluble
- Silver and lead chloride
- Common carbonates and hydroxides but sodium, potassium and ammonium
- Making insoluble salts: To makes a pure dry sample insoluble salt, use a precipitation reaction of 2 soluble salts and react them together.
- Example to make insoluble lead chloride: lead nitrate + sodium chloride -> lead chloride and sodium nitrate
- Soluble
- Common salts of sodium potassium and ammonium
- All nitrates
- Common chlorides expect silver and lead
- Common sulphates except lead barium and calcium
- Making soluble salts
- Method 1: reacting an acid that contains one of the ions you want in the salt and an insoluble base which contains the other ion, filter and evaporate
- Example: copper oxide + sulphuric acid -> copper sulphate + water
- Method 2: acid and alkali reaction using titration, evaporate and crystallise
- Method 1: reacting an acid that contains one of the ions you want in the salt and an insoluble base which contains the other ion, filter and evaporate
- Precipitation
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