devinwilson369
26.10.2019 •
Chemistry
Asolution of na2co3 is added dropwise to a solution that contains 1.12×10−2 m fe2+ and 1.45×10−2 m cd2+. what concentration of co32− is need to initiate precipitation? neglect any volume changes during the addition.
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Ответ:
The cadmium carbonate (CdCO3) will precipitate first.
We need 6.9 *10^-11 M CO3^2- to initiate precipitation.
Explanation:
Step 1: Given data
The solution contains
⇒ 1.12*10^-2 M Fe2+
⇒ 1.45*10^−2 M Cd2+
The Ksp of CdCO3 is 10^-12
The Ksp of FeCO3 is 3.13 * 10^-11
Step 2: Calculate concentration of CO3^2- in FeCO3
FeCO3(s) ⇔ Fe2+ + CO3^2- Ksp = 3.1*10^-11
Ksp = [Fe2+][CO3^2-]
[CO3^2-] = Ksp / [Fe2+]
[CO3^2-] = 3.13*10^-11 / 1.12*10^-2
[CO3^2-] = 2.795 * 10^-9 M
Step 3: Calculate concentration of CO3^2- in CdCO3
CdCO3(s) ⇔Cd^2+ + CO3^2- Ksp = 10^-12
Ksp = [Cd2][CO3^2-]
[CO3^2-] = Ksp /[Cd^2+]
[CO3^2-] = 10^-12 / 1.45x10^-2
[CO3^2-] =6.9 *10^-11 M
The cadmium carbonate (CdCO3) will precipitate first.
We need 6.9 *10^-11 M CO3^2- to initiate precipitation.
Ответ: