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  3. a solution is 5 mm in each of the following ions:

A solution is 5 mM in each of the following ions: number ion Ksp of M(OH)2 1 Mg2+ 1.8e-11 2 Cd2+ 2.5e-14 3 Co2+ 1.6e-15 4 Zn2+ 4.4e-17 5 Cu2+ 2.2e-20 Indicate which of...

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Chemistry

A solution is 5 mM in each of the following ions:

numberionKsp of M(OH)2
1Mg2+1.8e-11
2Cd2+2.5e-14
3Co2+1.6e-15
4Zn2+4.4e-17
5Cu2+2.2e-20

Indicate which of the metal ions would precipitate (or start toprecipitate) at each of the following pH values. Indicate youranswer with the number of the ion. Use 0 to indicate noprecipitate. If more than one precipitate is expected, list thenumbers in increasing order and separate them with commas. Forexample, 3,4,5 is ok but 5,4,3 is not.

pH = 5.00:

pH = 9.00:


What is the pH to the nearest 0.1 pH unit at whichMg(OH)2 begins to precipitate?

pH =

Answer & Explanation Solved by verified expert
4.1 Ratings (714 Votes)
All the given ions make MOH2 when react with OH ions The ions concentration is given as 5mM 5103 M 1 For Mg2 Ksp 18e11 181011 At precipitation Ksp Mg2OH2 181011 If Mg2 5103 M 5103 OH2 181011 OH sqrt181011 5103 6105 M Least molarity of OH required to precipitate 6105 M So pOH logOH log 6105 422 So pH 14    See Answer
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