Question
Asked Nov 20, 2019
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2. A solution is 0.10M in Mg(NO3)2.
a. What conce ntration of OH is required to just start precipitation
of Mg(OH)2? (Ksp 1.5x1011)
b. If NH3/NH4* buffer is used to control the pH, and [NH3] = 0.10
M, what concentration of NH4* is required to prevent the
precipitation of Mg(OH)2?
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2. A solution is 0.10M in Mg(NO3)2. a. What conce ntration of OH is required to just start precipitation of Mg(OH)2? (Ksp 1.5x1011) b. If NH3/NH4* buffer is used to control the pH, and [NH3] = 0.10 M, what concentration of NH4* is required to prevent the precipitation of Mg(OH)2?

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Expert Answer

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(a). Concentration of OH- required ...

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Mg(OH2M a) +2OH (aq solubility product constant will be equal to K-MgOH Rearrange the concentration of hydride ani ons к. Гон ]-, sp Mg plugin the values 1.5x10 Гон ]-, 0.1 v1.0x1010 =1.22x103 M

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Physical Chemistry

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