Salts

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Soluble Salts

Soluble salts are salts which dissolve in water.

Making soluble salts

Soluble salts can be made by reacting acids with solid, insoluble substances such as pure metals, metal oxides, metal hydroxides, or metal carbonates.

E.g. blue copper sulfate

Blue copper sulfate crystals are produced by adding black copper oxide to sulfuric acid:
- CuO_(s) + H₂SO_4(aq) → CuSO_4(aq) + H₂O_(l)

Required Practical - Separating Mixtures

The aim of this practical is to produce a pure, dry sample of a soluble salt from an insoluble oxide or carbonate.

Preparation

Gently warm an acid using a Bunsen burner,
Add the insoluble solid (with stirring) until no more reacts.

Filtration

Filter the solution to remove the excess insoluble solid.
- This will leave a solution of the salt dissolved in water.

Crystallisation

Heat the solution in an evaporating basin above a beaker of water.
- The 'water bath' ensures gentle heating.
Leave the solution to cool and allow more water to evaporate.
- As water evaporates, the solution will become more concentrated and the salt will begin to crystallise.

1Biology

1.1Practicals

1.1.1Microscope & Bacteria

1.1.2Bacteria

1.1.3Osmosis Tests

1.1.4Osmosis & Food Tests

1.1.5Enzymes

1.1.6Enzymes 2

1.1.7Photosynthesis & Plant Responses

1.1.8Photosynthesis Experiments

1.1.9Reaction Time

1.1.10Quadrats

1.1.11Decay

2Chemistry

2.1Practicals

2.1.1Salts

2.1.2Neutralisation

2.1.3Titration

2.1.4Electrolysis

2.1.5Electrolysis 2

2.1.6Rate of Reaction

2.1.7Rate of Reaction 2

2.1.8Chromatography

2.1.9Identifying Gases

2.1.10Identifying Gases 2

2.1.11Identifying Ions

2.1.12Carbonates, Halides & Sulfates

2.1.13Flame Emission Spectroscopy

2.1.14Water Purification

2.1.15Water Purification 2

3Physics

3.1Practicals

3.1.1Specific Heat Capacity

3.1.2Thermal Capacity & Insulation

3.1.3Latent Heat

3.1.4Resistance & Current

3.1.5Resistance & Current 2

3.1.6Density

3.1.7Density 2

3.1.8Force & Extension - Springs

3.1.9Waves - Ripple Tank

3.1.10Light

3.1.11Light Reflection & Refraction

3.1.12Radiation

3.1.13Radiation 2

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