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:
number ion K_sp 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 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 =

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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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number	ion	K_sp 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