# K sp : Solubility Constant Experiment # 31 - PowerPoint PPT Presentation

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K sp : Solubility Constant Experiment # 31. Purpose: To determine the solubility product constant for a sparingly soluble compounds. Equilibrium. A+B → C +D.

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K sp : Solubility Constant Experiment # 31

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## 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

• Pages 83-84

• Ignore # 5