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March 29, 2017

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Question: When 1.97 grams of Pb(OH)2(s) is added to 1.00 liter of pure water at 25 C a saturated solution (some solid is present) is formed that has a pH of 8.97. Compute the Ksp value for Pb(OH)2 using the data.

[OH]= 9.334e-6 and the [Pb^+2]= 9.334e-6/2= 4.667e-6. So the ksp= 9.334e-6 * 4.667e-6= 4.356e-11

  • Chemistry- please check my work - ,

    You didn't square the OH^-

  • Chemistry- please check my work - ,

    Right! so after i square it the correct answer would be 4.066e-16

  • Chemistry- please check my work - ,

    I think so. Look up Ksp in your set of Ksp tables and see how close that comes. I have an old quant book (about 15 years old) that shows 2.5 x 10^-16.

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