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Terdapat campuran 100 ml larutan HCN 0,1 dengan 500 ml NaCN 0,2 M, jika Ka HCN = 4.10 pangkat min 5. maka PH larutan tersebut adalah ...
Terdapat campuran 100 ml larutan HCN 0,1 dengan 500 ml NaCN 0,2 M, jika Ka HCN = 4.10 pangkat min 5. maka PH larutan tersebut adalah ...
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![Diketahui:\\mmol\ HCN=100\times0,1=10\ mol\\mmol\ NaCN=500\times0,2=100\ mmol\\Ka=4\times10^{-4}\\Ditanya:\\pH=---?\\-------------------------------\\Jawab:\\-------------------------------\\\\\displaystyle [H^+]=K_a\times\frac{mmol\ HCN}{mmol\ NaCN}=4\times10^{-4}\times\frac{10}{100}=4\times10^{-5}\ M\\\\\boxed{\boxed{\bold{pH=5-\log 4}}}](https://tex.z-dn.net/?f=Diketahui%3A%5C%5Cmmol%5C+HCN%3D100%5Ctimes0%2C1%3D10%5C+mol%5C%5Cmmol%5C+NaCN%3D500%5Ctimes0%2C2%3D100%5C+mmol%5C%5CKa%3D4%5Ctimes10%5E%7B-4%7D%5C%5CDitanya%3A%5C%5CpH%3D---%3F%5C%5C-------------------------------%5C%5CJawab%3A%5C%5C-------------------------------%5C%5C%5C%5C%5Cdisplaystyle+%5BH%5E%2B%5D%3DK_a%5Ctimes%5Cfrac%7Bmmol%5C+HCN%7D%7Bmmol%5C+NaCN%7D%3D4%5Ctimes10%5E%7B-4%7D%5Ctimes%5Cfrac%7B10%7D%7B100%7D%3D4%5Ctimes10%5E%7B-5%7D%5C+M%5C%5C%5C%5C%5Cboxed%7B%5Cboxed%7B%5Cbold%7BpH%3D5-%5Clog+4%7D%7D%7D "Diketahui:\\mmol\ HCN=100\times0,1=10\ mol\\mmol\ NaCN=500\times0,2=100\ mmol\\Ka=4\times10^{-4}\\Ditanya:\\pH=---?\\-------------------------------\\Jawab:\\-------------------------------\\\\\displaystyle [H^+]=K_a\times\frac{mmol\ HCN}{mmol\ NaCN}=4\times10^{-4}\times\frac{10}{100}=4\times10^{-5}\ M\\\\\boxed{\boxed{\bold{pH=5-\log 4}}}")
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