Question

give reason solubility of NaSo4. 10H2O decreases at 36degree Celsius pls answer fast it's urgent

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Answer 1

Answer:

Na₂SO₄.10H₂O is called Glauber's Salt.

In this salt we can note that it has 10 water molecules. So initially when it is heated till 36° C these water molecules evaporates and the solubility increases. Near 36° C all the water molecules gets evaporated and it becomes anhydrous salt. So when after this when heated the salt's solubility decreases as the dissolution process is exothermic.

Hope this help : )

Answer 2

Answer:

the solubility actually increases upto 32.4 degree Celsius , then decline. this is explain by the following:

sodium sulphate is naturally found as a decahydrate complex (has 10 water molecules in the crystal for every molecule of sodium sulphate).

At 32.4 degree Celsius the crystal breaks into sulphate liquid phase and an anhydrous solid phase or in other words the extra molecules in the complex detach from the sodium sulphate part of the salt.

that is why after the temperature the solubility decreases as it depends on the anhydrous sulphate.