Question

Please give a brief explanation as to why the following answers are correct.

a. Which solution should be the strongest electrolyte: 0.20 M BaCl2, 0.25 M NaCl, or 0.50 M sucrose?

Answer: 0.20 M BaCl2 > 0.25 M NaCl > 0.50 M sucrose. Give an explanation as to why this answer is correct involving the number and kinds of particles present in solution.

Explanation:

B. Arrange the substances water (H2O), propane (C3H8), and ethanol (CH3CH2OH) in terms of their
predicted solubility in hexane (C6H14).

Answer: propane (C3H8) > ethanol (CH3CH2OH) > water. Explain why this is the predicted order.

Explanation:

Answer 1

A. The strength of the electrolyte depends on its concentration as well as the number of free ions it can produce in solution. BaCl2 can produce 1 Bat and 2 CI ions. So, 0.2 M produce 0.2 M Bat and 0.4 M CI. NaCl can produce 1 Na+ and 1 CI ion. So, 0.25 M produce 0.25 M Na+ and 0.25 M CH which is lesser number of ions produced than that of BaCl2. Sucrose is not an electrolyte and it does not produce any ions. So, the order is 0.2 M BaCl2 > 0.25 M NaCl > 0.5 M Sucrose. B. Like dissolve like. So, polar solvents can dissolve polar compounds and non-polar solvents dissolve non-polar compounds. Hexane is non-polar and so is propane. Ethanol is less polar than water. So, solubility order is propane > ethanol > water.