18. Aqueous Equilibrium

Suppose that a 10-mL sample of a solution is to be tested for I- ion by addition of 1 drop (0.2 mL) of 0.10 M Pb1NO322. What is the minimum number of grams of I- that must be present for PbI21s2 to form?

The water supply for a midwestern city contains the following impurities: coarse sand, finely divided particulates, nitrate ions, trihalomethanes, dissolved phosphorus in the form of phosphates, potentially harmful bacterial strains, dissolved organic substances. Which of the following processes or agents, if any, is effective in removing each of these impurities: coarse sand filtration, activated carbon filtration, aeration, ozonization, precipitation with aluminum hydroxide?

(b) What is the most significant difference between the sulfides precipitated in group 2 and those precipitated in group 3?

Determine the minimum concentration of the precipitating agent on the right to cause precipitation of the cation from the solution on the left. c. 0.0018 M AgNO3; RbCl

Determine the minimum concentration of the precipitating agent on the right to cause precipitation of the cation from the solution on the left. b. 0.085 M CaI2; K2SO4

Determine the minimum concentration of the precipitating agent on the right to cause precipitation of the cation from the solution on the left. a. 0.035 M Ba(NO3)2; NaF

Using the qualitative analysis flowchart in Figure 17.18

, tell how you could separate the following pairs of ions. (a) Ag+ and Cu2+

Give a method for seperating the following pairs of ions by the addition of no more than two substances. (a) Hg2+ and Co2+

Assume that you have three white solids: NaCl, KCl, and MgCl2. What tests could you do to tell which is which?