why sodium hydroxide is much more water soluble than chloride
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NaOH + H2O = Na+ and OH- ions. The reaction will be Exothermic, where heat will be released. Sodium hydroxide is considered a strong base and as such is able to completely and fully disassociate in aqueous solution. The heat evolved as a result of mixing solid sodium hydroxide with water is due to the the -OH ions incredible stability. Heat is emitted as a result of the chemical species being brought to a lower energy state. This phenomena strong enough that sodium hydroxide crystals act as a powerful desiccant (it readily absorbs moisture from the air).
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The Water molecules move around the NaNaand ClCl and break the salt apart into ions. The polarity of the water molecule allows this by the more negative oxygen being attracted to the positive Na ions and the positive hydrogen being attracted to the negative chlorine ions. In the case of NaOH, I am assume that bond between Na+NaX+ and OH−OHX− is stronger than the bond in NaClNaCl. Also I don't see a case for the use of an equilibrium in this case because NaOHNaOH almost completely dissociates into its ions Na+ OH−NaX+ OHX−.
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