Experimental Techniques

Measurement

Appropriate apparatus must be used when measuring time, temperature, mass, and volume.

Volume

• Measuring cylinders measure medium volumes accurately
• Burettes have taps and can measure medium volumes even more accurately
• Pipettes are used to release drops of a liquid and are not good for measuring
• Graduated pipettes have lines on them and can measure small volumes accurately

Purity

Chromatography

Chromatography is used to separate soluble substances from each other using a solvent and chromatography paper. Some common uses of chromatography include separating:

• food colouring
• ink