i dilution of coloured solutions
Substances required: Water and Potassium Manganate (VI)
- When Potassium Manganate (VI) crystals are dissolved in water, a vivid purple solution is formed
- Dilute the solution several times – you will notice that the colour loses it’s intensity
- This indicated that there are a large number of particles of potassium manganate (VI) in a very small amount of solid. This indicates the particle size of potassium manganate (VI) – very small!
ii diffusion experiments
Particles of fluids will fill the space given to them
Diffusion of bromine (through flasks)
- Set up apparatus of 2 connected bromine flasks, with only one containing the bromine gs
- After 5 mins, the bromine from the flask on the right would have diffused into the flask on the left
- This happens because both air and bromine particles are moving randomly and there are large gaps between the particles – so the particles are forced to mix.