What is the effiect of temperature on the solubility of ionic salts

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hey

What is the effiect of temperature on the solubility of ionic salts such as NaCl, MgCO3 and NH4F?  I am doing coursework for my finals and am stuck on this question.  Thank you one and all.

Solubility of NaCl and NH4F is an endothermic process ..means heat is required for dissolving these salts in water ...hence their solubility increases with temperature 

However dissolution of MgCO3 is exothermic and heat is realeased.hence if temperature is raised its solubility decreases ...