How does an increase in temperature affect: 1) the solubility of NaCl , 2) the solubility of CaSO4 in water ?
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The solubility of the majority of solid substances increases as the temperature increases. Notice how the temperature dependence of NaCl is fairly flat, meaning that an increase in temperature has relatively little effect on the solubility of NaCl.
The solubility of KNO3 in water increases with the increase in temperature since dissolution of KNO3 in water is an endothermic process. The solubility of CaSO4 in water decreases with the increase in temperature since dissolution of CaSO4 in water is an exothermic process.
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