1) Rewrite each statement by choosing the correct word: a) A mixture of ethanol and water forms a suspension/solution. b) The particles in a solution/suspension settle out when the mixture is left to stand on a lab bench. c) Centrifuging a solution/suspension causes the particles to separate. d) The particles of a solution/suspension are not separated when passed through a filter paper. 2) In each of the following, 2g of each pair of solids is mixed together. Explain whether filtration techniques would be successful in separating them. The solubility of each substance in water is given in brackets. a) Magnesium sulfate (36.4g/100g water) mixed with lead iodide (0.08g/100g water) b) Barium carbonate (0.002g/100g water) mixed with silver oxide (0.002g/100g water) 3) State whether evaporation or distillation should be used to recover the following components from each mixture: a) Pure water from sea water b) Salt crystals from sea water c) Nickel sulfate from a green solution of nickel sulfate 4) A suspension can be filtered more rapidly by fluting the filter paper. Explain why filtration is faster using a fluted filter rather than a normal cone. 5) The table below shows the solubility of copper (II) sulfate crystals in water as a function of temperature.
a) Use the data provided to plot a solubility curve for copper sulfate crystals. Draw the line of best fit.
b) Copper (II) sulfate crystals (55g) are dissolved in 100g of hot water. The solution is evaporated to remove half of the water and then cooled to 25*C. Calculate the mass of copper (II) sulfate crystals that are formed. c) A 50g sample of impure copper sulfate contains 45g of copper (II) sulfate and 5g of potassium nitrate. The solubility of potassium nitrate in water is:
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