1. Iodine is very slightly soluble in water, but its solubility is so low that i

Question

1. Iodine is very slightly soluble in water, but its solubility is so low that it is very difficult to see any concentration gradients. Yet it is very esy to determine experimentally that it must be at least slight soluble in water. Why is it so easy?

2. HCL is a molecular compound yet is a strong electrolyte. What obviously must happen when HCl is dissolvd in water? what spevific species are responsible for HCl being a strong electrolite.

3. a 1M solution f CaCl2 is an even stronger electryolyte than 1M NaCl. Why?

Explanation / Answer

1:Iodine is slightly sluble due to absence of hydrogen bond and the slight soluble is due to weak induced dipole interaction between iodine and water molecule.

2: HCl is dissolved in water due to strong hydrogen bonding between water and HCl molecue.

3: Both CaCl2 and NaCl are strong electrolyte, but 1M slution of CaCl2 is a stronger electrolyte as it is dissociated to give 1 Ca2+ and 2 Cl-, where as 1M NaCl is dissociated to give only 1 Na+ and 1 Cl-. Hence 1M solution f CaCl2 is an even stronger electryolyte than 1M NaCl.

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