1 of 4 Homework 2 Chapter 13 uon Theory Potassium iodide is more soluble in meth

Question

1 of 4 Homework 2 Chapter 13 uon Theory Potassium iodide is more soluble in methyl alcohol, CH3OH, than in benzene, CH whereas naphthalene, C1oHg, is more soluble in benzene. Suggest expianations for both cases. n a solid substance dissolves, two processes are of prime importance: the breaking way of particles from the solid and the joining of solute and solvent particles. In terms of these two process, explain how the dissolving of sodium hydroxide can be exothermic, whereas for ammonium chloride the process is endothermic. 2. Whe 3. On the basis of size and charge (ionic charge density), choose the ion i each of the following pairs with the largest hydration energy (energy of solvation in H20) a. Na or 1 b. For c1-1 +2 C. Mg or A 4. Which of each of the following pars is the more soTuble in water? Explair your reasoning? a CHyOH or CH3CH3 b. CBrr CaBrz .CHgF r CHjc b. CBra or CaBr c. CH3F or CH 5. The solubility of sodium selenate, Na2 Se4 s as fol1ows: 84 g/100 ml of at 1000C· Would the dissolving of H20 at 35°C72.8 g/100 ml of H20 sodium selenate in water be endothermic or exothermic, i.e., would AHsoln be positive or negative? Explain. 6. The heat of solution. Hsoln , of NaHC03(s). ís-18.0K/mole will the solubility of NaHC03 increaše or decrease th decreasing temperature? 7· Wnen 50 ml of ethanol, CH3CH2OH, and 50 ml of water are mixed, heat is evolved and the resulting solution has a volume of 96 ml. Explain

Explanation / Answer

Ans 1 :

There is generule for solubility in the chemistry that says "Like dissolves Like".

Now since potassium iodide is a polar compound , it tends to be soluble in polar compounds such as methyl alcohol , whereas naphthalane is a non polar compound , so it is soluble in non polar solvents such as benzene.

The vice versa does not happen as the polar solutes cannot be dissolved into non polar solvents and non polar solutes cannot be dissolved in polar solvents.

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