Roboguru

Perbandingan volume larutan CH3COOH 0,1 M dan NaOH 0,1 M yang harus dicampurkan untuk membuat larutan penyangga dengan pH = 6 adalah ... (Ka = 10-5)

Pertanyaan

Perbandingan volume larutan CH3COOH 0,1 M dan NaOH 0,1 M yang harus dicampurkan untuk membuat larutan penyangga dengan pH = 6 adalah ... (Ka = 10-5)

Pembahasan Soal:

menentukan mol masing - masing larutan :

n space C H subscript 3 C O O H double bond M cross times V subscript 1 space space space space space space space space space space space space space space space space equals 0 comma 1 cross times V subscript 1 space space space space space space space space space space space space space space space space equals 0 comma 1 space V subscript 1 n space Na O H equals space M cross times V subscript 2 space space space space space space space space space space space equals 0 comma 1 cross times V subscript 2 space space space space space space space space space space space equals 0 comma 1 V subscript 2 

menentukan reaksi MRS:

NaOH harus habis agar larutan bersifat penyangga asam karena memiliki pH =6

menentukan perbandingan mol asam dengan  mol garam :

pH space space space space equals 6 open square brackets H to the power of plus sign close square brackets space equals 10 to the power of negative sign 6 end exponent open square brackets H to the power of plus sign close square brackets double bond Ka fraction numerator mol space asam over denominator mol space garam end fraction left square bracket 10 to the power of negative sign 6 end exponent right square bracket equals 10 to the power of negative sign 5 end exponent fraction numerator mol space C H subscript 3 C O O H over denominator mol space C H subscript 3 C O O Na end fraction left square bracket 10 to the power of negative sign 6 end exponent right square bracket equals 10 to the power of negative sign 5 end exponent fraction numerator 0 comma 1 V subscript 1 minus sign 0 comma 1 V subscript 2 over denominator 0 comma 1 space V subscript 2 end fraction left square bracket up diagonal strike 10 to the power of negative sign 6 end exponent end strike right square bracket equals up diagonal strike 10 to the power of negative sign 5 end exponent end strike fraction numerator up diagonal strike 0 comma 1 end strike open parentheses V subscript 1 bond V subscript 2 close parentheses over denominator up diagonal strike 0 comma 1 end strike space V subscript 2 end fraction V subscript 2 space space space space space equals 10 space open parentheses V subscript 1 bond V subscript 2 close parentheses V subscript 2 space space space space space equals 10 space V subscript 1 minus sign 10 space V subscript 2 V subscript 2 plus 10 space V subscript 2 space equals 10 space V subscript 1 11 space V subscript 2 space equals 10 space V subscript 1 V subscript 2 over V subscript 1 space space space space equals 10 over 11 

Jadi, perbandingan volume NaOH dengan CH3COOH adalah 10:11.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 06 Mei 2021

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