Some solids dissolve easily, others do not.<br>a) i) What is the name given to liquids which dissolve solids?<br>ii) What is the name of the clear liquid formed when a solid dissolves in a liquid?<br>b) Temperature change affects the solubility of substances in water.<br>i) How does the solubility of most solids change as the temperature of the water increases?<br>ii) How does the solubility of a gas change as the temperature of the water increases?<br>c) Describe how dry solid can be obtained from the liquid in which it is dissolved.<br>d) The graph shows how the solubility of ammonium sulphate in water changes with temperature.
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100 g of ammonium sulphate was heated in 100 g of water until it all dissolved. Use the graph to answer the following.<br>i) What is the lowest temperature at which the water will dissolve all the ammonium sulphate?<br>ii) What mass of solid will crystallize from the liquid when it is cooled to room temperature?<br>iii) This solid is filtered off at $$20^\circ\text{C}$$. What will you see if the remaining liquid is then cooled to $$15^\circ\text{C}$$?<br>iv) What word is used to describe a liquid which cannot dissolve any more solid at a given temperature?