Glauber salt shows anomalous solubility at which temperatures
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Anomalous solubility is not any term which needs definition rather it is a nature of some compounds through which they get change in their solubility. Thogh it may be defined as the the property throgh which a compound violets the rules of solubility
Actually the term "anomalous" means to deviate from an ideal rule or behaviour. So, whenever any compound deviates from general rule of solubilities then its solubility is known as Anomalous Solubility.
No matter wheather, the compound is a salt or an organic product or water itself as a solvent.
For example: In case of a gas in liquid solvent, solubility of gas increases with increase in temperature but when a non polar gase like inert gases are dissolved in water the solubility first decreases to a minimum and then rises. It is because the non polar gases are less soluble in water so they deviate from ideal behaviour.
Similarly in case of many organic solute and even medicinal compounds, they behave anomalous because of the differnce in chemical properties and structure.
Ofcourse, glauber salt is also an example of anomalous solubility.
Answer:
Solubility curves are continuous except in case of Glauber's salt, Na2SO4.10H2O, i.e., solubility increases with increase in temperature except in case of Na2SO4.10H2O. The solubility of Glauber's salt first increases with rise in temperature upto 32.4°C and then begins to decrease with increase in temperature above 32.4°C. This happens because below 32.4°C, sodium sulphate exists as Na2SO4.10H2O, which dissolves with absorption of heat and in endothermic processes, solubility increases with increase in temperature. Above 32.4°C, sodium sulphate exists as Na2SO4 which dissolves with evolution of heat and in such cases, solubility decreases with rise in temperature.
Explanation:
•Glauber's salt exhibits anomalous solubility•
This statement means that Glauber's salt is the only case where the solubility of Na2SO4.10H2O first increases with rise in temperature upto 32.4°C and then begins to decrease with increase in temperature above 32.4°C.