6. Ke dalam 200 ml larutan yang pHnya 8 dimasukkan 0,001 mg FeCl2 (Mr = 127). Apakah campuran tersebut telah membentuk endapan ? (Ksp. Fe(OH)2 = 4 x 10-14).
tolongin donk....
tolongin donk....
fatihahalhusna
![[Fe^{2+}]=\dfrac{0,001\times10^{-3}\times1000}{127\times200}=3,94\times10^{-8}\ M\\\\pH=8\rightarrow pOH=6\rightarrow [OH^-]=10^{-6}\ M\\\\Qsp\ Fe(OH)_2=[Fe^{2+}][OH^-]^2\\\\~~~~~~~~~~~~~~~~~~~~=(3,94\times10^{-8})(10^{-6})^2\\\\~~~~~~~~~~~~~~~~~~~~=3,94\times10^{-20}\\\\Qsp\ \textless \ Ksp\rightarrow \text{Tidak terbentuk endapan}}](https://tex.z-dn.net/?f=%5BFe%5E%7B2%2B%7D%5D%3D%5Cdfrac%7B0%2C001%5Ctimes10%5E%7B-3%7D%5Ctimes1000%7D%7B127%5Ctimes200%7D%3D3%2C94%5Ctimes10%5E%7B-8%7D%5C+M%5C%5C%5C%5CpH%3D8%5Crightarrow+pOH%3D6%5Crightarrow+%5BOH%5E-%5D%3D10%5E%7B-6%7D%5C+M%5C%5C%5C%5CQsp%5C+Fe%28OH%29_2%3D%5BFe%5E%7B2%2B%7D%5D%5BOH%5E-%5D%5E2%5C%5C%5C%5C%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%3D%283%2C94%5Ctimes10%5E%7B-8%7D%29%2810%5E%7B-6%7D%29%5E2%5C%5C%5C%5C%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%7E%3D3%2C94%5Ctimes10%5E%7B-20%7D%5C%5C%5C%5CQsp%5C+%5Ctextless+%5C+Ksp%5Crightarrow+%5Ctext%7BTidak+terbentuk+endapan%7D%7D "[Fe^{2+}]=\dfrac{0,001\times10^{-3}\times1000}{127\times200}=3,94\times10^{-8}\ M\\\\pH=8\rightarrow pOH=6\rightarrow [OH^-]=10^{-6}\ M\\\\Qsp\ Fe(OH)_2=[Fe^{2+}][OH^-]^2\\\\~~~~~~~~~~~~~~~~~~~~=(3,94\times10^{-8})(10^{-6})^2\\\\~~~~~~~~~~~~~~~~~~~~=3,94\times10^{-20}\\\\Qsp\ \textless \ Ksp\rightarrow \text{Tidak terbentuk endapan}}")
6 votes
Thanks 13