K sp : Solubility Constant Experiment # 31

Ksp: Solubility ConstantExperiment # 31 • Purpose: • To determine the solubility product constant for a sparingly soluble compounds.

Equilibrium A+B → C +D • At Equilibrium : the rate forward producing products (C + D) equals the rate reverse producing reactants (A + B ). • Thus products (C +D) are being produced at the same rate as the reactants (A + B) are being produced. • Solubility Product Constant the degree to which the solid(solute) is soluble in water.

Ksp = [Cu+2][IO3-]2 When soln is saturated Ion product Part # 1 Cu(IO3)2- Cu+2 + 2IO3-1solidIons in soln

Data for Calibration Graph

Lou Tisone 118-30 Concentration Vs. Absorbance A B S M X 10- 3

Part #1 • Determine Ksp by: • the initial concentration of Cu+2 is 8.00 x 10-2 • This is the concentration for all 3 trials • The initial concentration of IO3- 1 determined in pre- lab • This changes for each trial • Determinethe equilibrium concentration of both IO3-1 (from the data) and the Cu+2 equilibrium from (Graph).

Table #31.1 y = 0.08x+2.0X10-16 From Calibration Graph

Part # 2 Determine the Ksp of MOM Mg(OH)2 → Mg 2++2(OH) -1 trial # 1 pOH = 14-8.75 = 5.25 OH-1= 10 - 5.25 = 5.62X10 -6 Mg 2+= ½* 5.62X10 -6 = 2.81X10 -6 KSP= [Mg 2+]*[OH-1]2 = 8.87X10-17

Due Next Week • Pages 83-84 • Ignore # 5

K sp : Solubility Constant Experiment # 31