Question

predict which solution will have high electrical conductivity

Question 2: Give one example of a situation with high kinetic energy and one example of a situation with high potential energy. Explain your answers for full credit (4 pts). Question 3: Predict which solutions will have a higher electrical conductivity. Justify your choice for full credit (4 pts). A. 0.200 M NaCl or 0.150 M CaCl2 B. 14.22 g of cobalt(II) nitrate in 57.8 mL of water or 9.528 g of copper (II) chloride in 32.9 mL of water.

Answer 1

Electrical conductivity of solution depends on the concentration of ions present and on the magnitude of charge present on the ions .

(a) 0.150M CaCl₂ solution would have higher electrical conductivity . Because of higher charge on the Ca²⁺ ions .

(b)

Concentration of Co(NO₃)₂ = (14.22g/182.943g/mol)×(1000/57.8) = 1.3448M

Concentration of CuCl₂ =( 9.528g/134.452g/mol)×(1000/32.9) = 2.154 M

The charge factor is same in both solutions, but number of ions in copper (II) chloride is more, hence 9.528g of copper (II) chloride in 32.9ml of water has higher electrical conductivity . (Answer)