Chemistry
Give reasons for the following
Solubility curves find utility in separation and purification of solutes.
Water
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Answer
When a saturated solution of a given mixture of solutes is cooled, those fractions with very low solubilities will be the first to crystallize out from the solution.
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Related Questions
Select the correct word from the words in brackets to complete each sentence :
- If pressure on the surface of water increases it's boiling point …………… and freezing point …………… [increases/decreases].
- A saturated solution can be converted to an unsaturated solution by …………… [increasing/decreasing] the amount of the solvent.
- Dissolved air in water contains a …………… [higher/lower] percentage of oxygen than ordinary air.
- At low temperatures the solubility of a gas in water is …………… [less/more] compared to that at ordinary temperatures.
- Efflorescence occurs when the vapour pressure of the hydrated crystals is …………… [more/less] than the vapour pressure of the atmospheric humidity.
Select the correct answer from the choice given in the brackets.
- An anhydrous crystal. [blue vitriol / epsom salt / lead chloride].
- A substance which causes hardness in water. [NH4Cl/CaCl2/NaCl]
- A deliquescent salt of a divalent metal. [CuCl/CaCl2/FeCl2/PbCl2]
- An anhydrate of a heptahydrate salt. [Cu(NO3)2/Ca(NO3)2/FeSO4/CaSO4]
- A drying agent, deliquescent in nature used in a dessicator. [conc. H2SO4/ fused CaCl2/FeCl3]
Give reasons for the following
Pressure and temperature influence the solubility of gases in water.
Give reasons for the following
Heating a hydrated copper sulphate crystal is deemed a chemical change.