Answer to Question #163231 in General Chemistry for Elizabeth

Question

8.What is the maximum concentration of Mg++, in formula weights per liter that can exist in a solution which is 0.5F with respect to NH4Cl and 0.1 F with respect to NH3.

9. Aa solution containing 10 g each of Ba++ and Pb++ per liter, potassium chromate is added dropwise, which will precipitate first?

10. Calculate whether or not precipitate will be formed in each case a. 85 mL of 0.7 F lead nitrate + 150 mL NH3 b. 1L of 1.5 F H2SO4 + 800 mL of 0.9 F SrCl2 c. 5 g of MgCl2 in 85 mL H2O + 50 mL 1.2 F HF 

Answer 1

8. Write the equation used to calculate the weight/volume (%) : weight/volume (%) = (mass solute ÷ volume of solution) × 100.

9. The solubility of an ionic compound decreases in the presence of a common ion. A common ion is any ion in the solution that is common to the ionic compound being dissolved. We must calculate the reaction quotient under these conditions. If Q is greater than Ksp, we can expect the reaction to shift to the left and form solid substance.

10. The reaction quotient, Q, can be used to determine whether a precipitate will form with a given concentration of ions. If Q < Ksp, no precipitate will form. If Q = Ksp, a precipitate will form. If Q > Ksp, a precipitate will form.