Why i2 is insoluble in water but soluble in ki solution?
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The I2 molecules in iodine are not very soluble in water because they are not alike. I2 is non-polar whereas H2O is polar. But KI solution contains I- ions which combine with the I2 molecules to form I3- ions because these are charged they dissolve in the water which is a polar solvent.
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The polar KI causes somewhat charged separation in the iodine molecule hence makes it somewhat polar which helps the iodine to be soluble in KI. So, the iodine molecule is soluble in KI rather than water. Therefore, due to the compound formation, I2 more soluble in KI than water.
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