Donald McQuarrie Peter A.Rock Ethan Gallogly Map Grade Categ Consider an amphote

Question

Donald McQuarrie Peter A.Rock Ethan Gallogly Map Grade Categ Consider an amphoteric hydroxide, M(OH)s), where M is a generic metal. M OH )2(s) M2+(aq) +2OH-(aq) Ma2OH (a M(OH)2(s) +2011-( [M(OFI,]"(aq) K,-0.05 Estimate the solubility of M(OH2 in a solution buffered at pH 7.0, 10.0, and 14.0. K,#7x10-16 You can check You can view Estimate the solubility of M(OH)2 in a solution buffered at pH You can keep you get it rig You lose 5% n your ques 7.0, 1001 and 140. pH 10.0 pH = 14.0 Number Number Number Help With O Web Help .O Previous Give Up & View Sohton (OCWX Answer ·Next Exit Hint

Explanation / Answer

solubility for Mg(OH)2 where the pH is l0

Ksp = 7 x l0^-16th = (Mg++)(OH)^2 Mg(OH)2(s) at equilib Mg++(aq) + 2 OH-(aq)

If the pH is l0 then the pOH is 4 because pH + pOH = 14

and if the pOH is 4, then the (OH-) concentration = antilog(-pOH)

antilog (-4) = 1 x l0^-4

Ksp 7 x 10^-16 = (Mg++)(1 x 10^-4)^2

(Mg++) = 7 x 10^-16 over 1 x 10^-8 = 7 x 10^-8 Moles per liter solubility
Mg(OH)2 when pH is l0

you can do the others the same way

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