In-Lab Guidelines (This is a guide to the information you should be observe whil

Question

In-Lab Guidelines (This is a guide to the information you should be observe while in the laboratory Record this information on the data sheets and turn in the duplicate pages of your observations to your Instructor before you leave the laboratory period.) Temperatire of the lab Concentration of HCI used Volume satureated Ca(OH), used 2 0.050 20 ec mL Per flask Trial 1 Trial 2 Trial 3 Initial buret reading Final buret reading Volume HCI used Dm mL mL. mL Experimental Observations: (Record your observations. Did you overshoot the end point? Was there anything noticed? Spills?) Soluble Com Experiment 7 Determination of the , of a Slightly

Explanation / Answer

To calculate Ksp of Ca(OH)2

Calculations

Volume of Ca(OH)2 solution = 20 ml = 0.020 L

Molarity of HCl = 0.05 M

Average volume HCl = 15.8 ml = 0.0158 L

average moles HCl = 0.05 M x 0.0158 L = 0.00079 moles

average [OH-] = 0.00079 moles/0.020 L = 0.0395 M

average [Ca2+] = 0.0395 moles/2 = 0.01975 M

Ksp = [Ca2+][OH-]^2

       = (0.01975)(0.0395)^2

       = 3.08 x 10^-5

Molar solubility of Ca(OH)2 = 0.01975 M

solubility of Ca(OH)2 = 0.01975 mol/L x 74.093 g/mol

                                  = 1.46 g/L

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