Question

e. 6.2x10 M Which of the following best describes what happens to the solubility of Pbly when it is dissolved in a 0.10 M Nal solution, compared with pure water? For Pblz, Ksp=6.5 x 10 a. Pbly is more soluble in 0.10 M Nal solution than in pure water b. Pbl, is less soluble in 0.10 M Nal solution than in pure water c. the solubility of Pbly is the same in both a 0.10 M Nal solution and in pure water In which of the following aqueous solutions would you expect AgCl to have the highest solubility? a. pure water b. 0.020 M Baci, c. 0.015 NaCl d. 0.020 AgNO, e. 0.020 KC

Answer 1

For first question answer is (b)

Explanation: Due to presence of a common ion the solubility of sparingly soluble salt will decrease. This is known as common ion effect. When PbI2 is dissolved in 0.10M NaI then the iodide ion generated from NaI will common to the iodide of PbI2. so due to common ion effect solubility will be less. for this reason, option a. and c. are wrong.

For second question answer is (a)

Reason: When AgCl soluble in pure water then there is no common ion effect. so solubility will be highest. For all the remaining options, there are common ions present. For b, c, e the Cl- and for d the Ag+ ions are common with the Cl- of AgCl.