3. On the basis of size and charge (onic charge density), choose the ion i each

Question

3. On the basis of size and charge (onic charge density), choose the ion i each of the following pairs with the largest hydration energy (energy of solvation n H20) a. Na*1 or K1 b. F1 or c1 +2 4. Which of each of the following pairs is the more soTuble in water? Explai your reasoning? a. CH30H or CH3CH3b. cBr4 or CaBr2 d. NH3 or PH3 c. CH3F or CH3CT f. CH3CH20H or CH30CH3 e. C02 or COS 5. The solubility of sodium selenate, Na2Se04. i H20 at 350g; 72.8g/ 100 of H20 at2100 c. would thedissolvingof sodium selenate in be positive or negative? Explain ater be endothermic or exothermic, i.e., would AHsoln 6. The heat of solution, LSHsoln , of NaHC03(s) is -18.0KJ/mole will the asing temperatu re? ml of ethano1, CH3CH20H, and 50 ml of water are mixed, heat is evolved and the resulting solution has a volume of 96 m. Explain

Explanation / Answer

Ans 3 : The hydration energy of the ions is basically dependent on two factors, the charge of ion , and the size of ion.

Higher the charge , higher will be its hydration energy , smaller the size , higher the hydration energy.

When considering both the factors together , the charge of the ion is given the priority.

So here , the ion with higher hydration energy is :

a) Na+1

b) F-1

c) Al+3

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