Seratus mL larutan NaOH diencerkan 10kali sehingga diperoleh larutan NaOH dengan pH = 10. berapa pH larutan NaOH sebelum diencerkan?
fatihahalhusna
![\text{Diketahui:}\\V_1=100\ mL\\V_2=10\times100=1000\ mL\\pH\ setelah\ diencerkan=10\\\text{Ditanya:}\\pH\ sebelum\ diencerkan=---?\\\text{Jawab:}\\pH=10\rightarrow pOH=4\rightarrow [OH^-]=10^{-4}\ M\rightarrow M_2=10^{-4}\ M\\\\V_1.M_1=V_2.M_2\\100.M_1=1000.\times10^{-4}\\M_1=10^{-3}\ M\\\\{[OH^-]}=10^{-3}\ M\\pOH=3\\\boxed{\bold{pH=11}}](https://tex.z-dn.net/?f=%5Ctext%7BDiketahui%3A%7D%5C%5CV_1%3D100%5C+mL%5C%5CV_2%3D10%5Ctimes100%3D1000%5C+mL%5C%5CpH%5C+setelah%5C+diencerkan%3D10%5C%5C%5Ctext%7BDitanya%3A%7D%5C%5CpH%5C+sebelum%5C+diencerkan%3D---%3F%5C%5C%5Ctext%7BJawab%3A%7D%5C%5CpH%3D10%5Crightarrow+pOH%3D4%5Crightarrow+%5BOH%5E-%5D%3D10%5E%7B-4%7D%5C+M%5Crightarrow+M_2%3D10%5E%7B-4%7D%5C+M%5C%5C%5C%5CV_1.M_1%3DV_2.M_2%5C%5C100.M_1%3D1000.%5Ctimes10%5E%7B-4%7D%5C%5CM_1%3D10%5E%7B-3%7D%5C+M%5C%5C%5C%5C%7B%5BOH%5E-%5D%7D%3D10%5E%7B-3%7D%5C+M%5C%5CpOH%3D3%5C%5C%5Cboxed%7B%5Cbold%7BpH%3D11%7D%7D "\text{Diketahui:}\\V_1=100\ mL\\V_2=10\times100=1000\ mL\\pH\ setelah\ diencerkan=10\\\text{Ditanya:}\\pH\ sebelum\ diencerkan=---?\\\text{Jawab:}\\pH=10\rightarrow pOH=4\rightarrow [OH^-]=10^{-4}\ M\rightarrow M_2=10^{-4}\ M\\\\V_1.M_1=V_2.M_2\\100.M_1=1000.\times10^{-4}\\M_1=10^{-3}\ M\\\\{[OH^-]}=10^{-3}\ M\\pOH=3\\\boxed{\bold{pH=11}}")
2 votes
Thanks 5
More Questions From This User See All