+ 15) The table lists the solubility at different T of potassium bitartrate and

Question

+ 15) The table lists the solubility at different T of potassium bitartrate and sodium bitartrate (used as a food additive). Consider the following: I. Ion-ion interactions in the solid salts are stronger than ion-water interactions in aqueous solution. II. Ion-ion interactions in the solid salts are weaker than ion-water interactions in aqueous solution. III. Interaction between water molecules and Na+ ions are stronger than interactions between water molecules and K+ ions. IV. Interaction between water molecules and Na+ ions are weaker than interactions between water molecules and K+ ions Which combination of statements best explains the observed Solubility trends? a) l and III b) I and IV c) II and III d) II and IV

Explanation / Answer

First option that ion ion interaction are stronger than ion water interaction so to loosen the ion ion interction in water some energy is required thus increasing the temperature increases the energy of the system and hence increase the solubility

III rd option suggests that more the charge density on cation more will be the interaction with the water dipole, more will be the solvation and more will be the solubility. charge density decreses with size of ion and K has larger size

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