1.

Lattice energy of Na_(2)CO_(3) is -205 kJ/mole and hydration energy of Na^(+) ion & CO_(3)^(2-) ion are -80kJ/mole and -40kJ/mole respectively. What can be predicted about solubility of Na_(2)CO_(3) in water from the above data.

Answer»

The SOLUBILITY of `Na_(2)CO_(3)` will increase will increase in temperature
The solubility of `Na_(2)CO_(3)` will decrease with increase in temperature
The solubility of `Na_(2)CO_(3)` will REMAIN constant.

Solution :(A)

`=205+(-2 xx80-40)`
`=+5`
`IMPLIES `The process is endothermic
So, the solubility will increase with increase in temperature .


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