Pada soal, terdapat kesalahan penulisan jenis asam, seharusnya, HCOOH merupakan asam format, bukanlah asam asetat. Asam format merupakan asam lemah dan NaOH merupakan basa kuat. Ketika asam lemah dan basa kuat direaksikan, terdapat dua kemungkinan: terbentuknya larutan penyangga atau terjadi proses hidrolisis garam. Untuk mengetahui hal tersebut, perlu dihitung jumlah masing-masing larutan.
![begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell mol space H C O O H space end cell equals cell space M space H C O O H cross times V space H C O O H end cell row blank equals cell space 0 comma 04 space M cross times 1 space L end cell row blank equals cell space 0 comma 04 space mol end cell row cell mol space Na O H thin space end cell equals cell space fraction numerator massa space Na O H over denominator italic M subscript r space Na O H end fraction end cell row blank equals cell space fraction numerator 1 comma 6 space g over denominator 40 space g space mol to the power of negative sign 1 end exponent end fraction end cell row blank equals cell space 0 comma 04 space mol end cell end table end style](data:image/png;base64,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)
![](https://imgix2.ruangguru.com/assets/miscellaneous/png_o8ejlh_8699.PNG)
Larutan penyangga terjadi ketika asam lemah berlebih bereaksi dengan basa kuat. Reaksi hidrolisis garam terjadi apabila jumlah mol reaktan habis bereaksi menghasilkan garam dan air. Oleh karena itu, garam yang dihasilkan akan terhidrolisis sebagian. Spesi yang berasal dari asam lemah akan bereaksi dengan air menghasilkan ion
, sehingga, untuk menentukan pH larutan digunakan rumus berikut.
![begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets O H to the power of minus sign close square brackets space end cell equals cell space square root of K subscript w over K subscript a left square bracket H C O O minus sign right square bracket end root end cell end table end style](data:image/png;base64,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)
Garam HCOONa dalam air akan terurai menjadi ion-ionnya seperti reaksi berikut,
![begin mathsize 14px style H C O O Na left parenthesis italic a italic q right parenthesis yields H C O O to the power of minus sign left parenthesis italic a italic q right parenthesis plus Na to the power of plus sign left parenthesis italic a italic q right parenthesis end style](data:image/png;base64,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)
sehingga, konsentrasi ion
akan sama dengan konsentrasi garam
. Nilai
asam format adalah
. Oleh karena itu, konsentrasi ion
dapat ditentukan.
![table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets H C O O Na close square brackets space end cell equals cell space fraction numerator mol space H C O O Na over denominator V space total end fraction end cell row blank equals cell fraction numerator 0 comma 04 space mol over denominator 1 space L end fraction end cell row blank equals cell space 0 comma 04 space M space equals space open square brackets H C O O to the power of minus sign close square brackets end cell row cell open square brackets O H to the power of minus sign close square brackets space end cell equals cell space square root of fraction numerator 10 to the power of negative sign 14 end exponent over denominator 1 comma 8 cross times 10 to the power of negative sign 4 end exponent end fraction cross times 0 comma 04 end root end cell row blank equals cell 1 comma 5 cross times 10 to the power of negative sign 6 end exponent end cell row cell pOH space end cell equals cell space 6 minus sign log 1 comma 5 end cell row cell pH and pOH end cell equals 14 row pH equals cell 14 minus sign pOH end cell row pH equals cell 14 minus sign left parenthesis 6 minus sign log 1 comma 5 right parenthesis end cell row cell pH space end cell equals cell space 8 plus log 1 comma 5 end cell end 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Jadi, pH larutan campurannya adalah 8 + log 1,5.