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100 mL larutan NH4OH 0,1 M (Kb = 10-5) dicampur de...

100 mL larutan NH4OH 0,1 M (Kb = 10-5) dicampur dengan 50 mL larutan NH4CI 0,2 M

a. Hitung pH larutan sebelum dicampur!

Jawaban:

Sebelum dicampur, larutan NH4OH merupakan basa lemah, untuk menghitung pHnya, perlu dicari terlebih dahulu konsentrasi dari OH- maka dimasukkan ke persamaan:

begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets space equals space square root of Kb point space Mb end root open square brackets O H to the power of minus sign close square brackets space equals space square root of 10 to the power of negative sign 5 end exponent space x space 0 comma 1 space M end root open square brackets O H to the power of minus sign close square brackets space equals space square root of 10 to the power of negative sign 6 end exponent end root open square brackets O H to the power of minus sign close square brackets space equals space 10 to the power of negative sign 3 end exponent  pOH space equals space minus sign space log space open square brackets O H to the power of minus sign close square brackets pOH space equals space minus sign space log space 10 to the power of negative sign 3 end exponent pOH space equals space 3 space space space pH space equals space 14 space minus sign space pOH space space space pH space equals space 14 space minus sign space 3 space space space pH space equals space 11 end style 
 

Jadi, pH larutan sebelum dicampur adalah 11. 

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