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100 mL larutan dimetilamina   0,01 M mempunyai pH = 11+log 3. Hitunglah pH larutan setelah ditambahkan 100 mL larutan HCl 0,01 M!

Pertanyaan

100 mL larutan dimetilamina begin mathsize 14px style open parentheses open parentheses C subscript 2 H subscript 5 close parentheses subscript 2 N H close parentheses end style  0,01 M mempunyai pH = 11+log 3. Hitunglah pH larutan setelah ditambahkan 100 mL larutan HCl 0,01 M!

Pembahasan Video:

Pembahasan Soal:

begin mathsize 14px style open parentheses C subscript 2 H subscript 5 close parentheses subscript 2 N H space end stylemerupakan senyawa yang bersifat basa lemah.

Menghitung Kb terlebih dahulu

table attributes columnalign right center left columnspacing 0px end attributes row size 14px pH size 14px equals cell size 14px 11 size 14px plus size 14px log size 14px space size 14px 3 end cell row size 14px pOH size 14px equals cell size 14px 14 size 14px minus sign begin mathsize 14px style left parenthesis 11 plus log space 3 right parenthesis end style end cell row size 14px pOH size 14px equals cell size 14px 3 size 14px minus sign size 14px log size 14px space size 14px 3 end cell row cell begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets end style end cell size 14px equals cell size 14px 3 size 14px space size 14px cross times size 14px space size 14px 10 to the power of size 14px minus sign size 14px 3 end exponent end cell row cell begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets end style end cell size 14px equals cell square root of size 14px Kb size 14px space size 14px cross times size 14px space size 14px Mb end root end cell row cell size 14px 3 size 14px space size 14px cross times size 14px space size 14px 10 to the power of size 14px minus sign size 14px 3 end exponent end cell size 14px equals cell square root of size 14px Kb size 14px space size 14px cross times size 14px space size 14px 10 to the power of size 14px minus sign size 14px 2 end exponent end root end cell row cell begin mathsize 14px style left parenthesis 3 space cross times space 10 to the power of negative sign 3 end exponent right parenthesis end style to the power of size 14px 2 end cell size 14px equals cell begin mathsize 14px style left parenthesis square root of Kb space cross times space 10 to the power of negative sign 2 end exponent end root right parenthesis end style to the power of size 14px 2 end cell row cell size 14px 9 size 14px space size 14px cross times size 14px space size 14px 10 to the power of size 14px minus sign size 14px 6 end exponent end cell size 14px equals cell size 14px Kb size 14px space size 14px cross times size 14px space size 14px 10 to the power of size 14px minus sign size 14px 2 end exponent end cell row size 14px Kb size 14px equals cell size 14px 9 size 14px space size 14px cross times size 14px space size 14px 10 to the power of size 14px minus sign size 14px 4 end exponent size 14px space end cell end table 

Menuliskan persamaan kimia larutan campuran

Yang tersisa adalah garam yang bersifat asam, maka pH dihitung menggunakan rumus:

Error converting from MathML to accessible text. 

Jadi, pH campuran larutan adalah 7-log 2,4

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 18 Juli 2021

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