Roboguru

Untuk membuat larutan penyangga dengan pH=4, hitung berapa mililiter  yang harus ditambahkan kedalam .

Pertanyaan

Untuk membuat larutan penyangga dengan pH=4, hitung berapa mililiter undefined yang harus ditambahkan kedalam begin mathsize 14px style 250 space mL space larutan space C H subscript 3 C O O H space 0 comma 25 space M space left parenthesis K subscript a equals 10 to the power of negative sign 5 end exponent right parenthesis end style.undefined 

Pembahasan Soal:

Larutan penyangga di atas bersifat asam. 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals 4 row cell open square brackets H to the power of plus sign close square brackets end cell equals cell 10 to the power of negative sign 4 end exponent space M end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell K subscript italic a cross times fraction numerator mmol space asam over denominator mmol space garam end fraction end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell K subscript italic a cross times fraction numerator mmol space C H subscript 3 C O O H over denominator mmol space C H subscript 3 C O O Na end fraction end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell K subscript italic a cross times fraction numerator V space C H subscript 3 C O O H cross times M space C H subscript 3 C O O H over denominator V space C H subscript 3 C O O Na cross times M space C H subscript 3 C O O Na end fraction end cell row cell 10 to the power of negative sign 4 end exponent end cell equals cell 10 to the power of negative sign 5 end exponent cross times fraction numerator 250 space mL cross times 0 comma 25 space mmol forward slash mL over denominator V space C H subscript 3 C O O Na cross times 0 comma 24 space mmol forward slash mL end fraction end cell row cell V space C H subscript 3 C O O Na end cell equals cell fraction numerator 10 to the power of negative sign 5 end exponent cross times 250 space mL cross times 0 comma 25 space mmol forward slash mL over denominator 10 to the power of negative sign 4 end exponent M cross times 0 comma 24 space mmol forward slash mL end fraction end cell row cell V space C H subscript 3 C O O Na end cell equals cell 26 space mL end cell row blank blank blank end table end style 

Jadi volume begin mathsize 14px style C H subscript bold 3 C O O Na end style yang harus ditambahkan adalah 26 mL.undefined 

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 01 April 2021

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