Consider the following qualitative analysis scenario and then classify what type
ID: 500935 • Letter: C
Question
Consider the following qualitative analysis scenario and then classify what type of qualitative analysis principle is being used. Both Mn2 and Cu2 can be precipitated by hydroxide. However, they can be quantitatively separated because Mn(OH)2(s) has a Ksp =1.6×10–13 while Cu(OH)2(s) has a Ksp =4.8×10–20.
Options: Competitive equilibrium solubilization: anion protonation, selective precipitation, fractional precipitation, Competitive equilibrium solubilization: cation complexation, Selective oxidation/reduction, and Amphoteric Precipitate Solubilization.
Explanation / Answer
Here selective precipitation can be used. Thee is diffrence in the Ksp values for both the hydroxides. So first Cu (OH)2 will be precipitated.