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Larutan  0,2 M sebanyak 10 mL ditambahkan ke dalam...

Larutan begin mathsize 14px style Na O H end style 0,2 M sebanyak 10 mL ditambahkan ke dalam 20 mL larutan begin mathsize 14px style C H subscript 3 C O O H end style 0,1 M (begin mathsize 14px style K subscript a equals 10 to the power of negative sign 5 end exponent end style), maka tentukan harga pH larutan campuran tersebut!

Jawaban:

Langkah 1: menghitung mol begin mathsize 14px style Na O H bold space bold dan bold space C H subscript bold 3 C O O H end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell mol subscript NaOH end cell equals cell V subscript NaOH cross times M subscript NaOH space end cell row blank equals cell 10 space mL cross times 0 comma 2 space M end cell row blank equals cell 2 space mmol end cell end table end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell mol subscript C H subscript 3 C O O H end subscript end cell equals cell V subscript C H subscript 3 C O O H end subscript cross times M subscript C H subscript 3 C O O H end subscript end cell row blank equals cell 20 space mL cross times 0 comma 1 space M end cell row blank equals cell 2 space mmol end cell end table end style


Langkah 2: membuat persamaan reaksi MRS

Langkah 3: menghitung konsentrasi garam begin mathsize 14px style C H subscript bold 3 C O O Na end style

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Langkah 4: menghitung konsentrasi begin mathsize 14px style O H to the power of bold minus sign end style

table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets O H close square brackets end cell equals cell square root of K subscript w over K subscript a open square brackets C H subscript 3 C O O Na close square brackets cross times Valensi space Garam end root end cell row blank equals cell square root of 10 to the power of negative sign 14 end exponent over 10 to the power of negative sign 5 end exponent left parenthesis 6 comma 7 cross times 10 to the power of negative sign 2 end exponent right parenthesis end root cross times 1 end cell row blank equals cell square root of 6 comma 7 cross times 10 to the power of negative sign 11 end exponent end root end cell row blank equals cell 8 comma 18 cross times 10 to the power of negative sign 6 end exponent space M end cell end table  


Langkah 5: menghitung pH

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pOH equals cell negative sign log space open square brackets O H to the power of minus sign close square brackets end cell row blank equals cell negative sign log space 8 comma 18 cross times 10 to the power of negative sign 6 end exponent end cell row blank equals cell 6 minus sign log space 8 comma 18 end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell pKw bond pOH end cell row blank equals cell 14 minus sign left parenthesis 6 minus sign log space 8 comma 18 right parenthesis end cell row blank equals cell 8 plus log space 8 comma 18 end cell end table end style


Jadi, pH larutan campuran tersebut adalah 8 + log 8,18.

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