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Garam kalium asetat dibuat dengan mencampurkan 300...

Garam kalium asetat dibuat dengan mencampurkan 300 mL larutan begin mathsize 14px style K O H space 0 comma 09 space M end style kedalam larutan begin mathsize 14px style C H subscript 3 C O O H space 0 comma 09 space M end style. Jika begin mathsize 14px style K subscript italic a space C H subscript 3 C O O H space adalah space 1 comma 8 cross times 10 to the power of negative sign 5 end exponent end style. Hitunglah pH dari larutan tersebut!undefined 

Jawaban:

 
 

Garam begin mathsize 14px style C H subscript 3 C O O K end style mengalami hidrolisis yang berasal dari asam lemah dan basa kuat, berarti bersifat basa. 

begin mathsize 14px style C H subscript 3 C O O K left parenthesis italic a italic q right parenthesis yields with plus air on top C H subscript 3 C O O to the power of minus sign left parenthesis italic a italic q right parenthesis plus K to the power of plus sign left parenthesis italic a italic q right parenthesis end style 

Anion dari asam lemah begin mathsize 14px style C H subscript 3 C O O to the power of minus sign end style akan bereaksi dengan air (terhidrolisis) sesuai dengan persamaan reaksi berikut.

begin mathsize 14px style C H subscript 3 C O O to the power of minus sign left parenthesis italic a italic q right parenthesis plus H subscript 2 O open parentheses italic l close parentheses equilibrium C H subscript 3 C O O H left parenthesis italic a italic q right parenthesis plus O H to the power of minus sign left parenthesis italic a italic q right parenthesis end style 

Adanya ion begin mathsize 14px style O H to the power of minus sign end style dalam hasil reaksi menunjukkan bahwa larutan garam tersebut bersifat basa.

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 end cell equals cell square root of K subscript italic w over K subscript italic a cross times left square bracket garam end root right square bracket end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell 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 5 end exponent end fraction cross times 9 cross times 10 to the power of negative sign 2 end exponent end root end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell 7 comma 07 cross times 10 to the power of negative sign 6 end exponent space M end cell row blank blank blank 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 pOH equals cell negative sign log left square bracket 7 comma 07 cross times 10 to the power of negative sign 6 end exponent right square bracket end cell row pOH equals cell 6 minus sign log space 7 comma 07 end cell row blank blank blank row pH equals cell 14 minus sign pOH end cell row pH equals cell 14 minus sign left parenthesis 6 minus sign log space 7 comma 07 right parenthesis end cell row pH equals cell space 8 plus log space 7 comma 07 end cell end table end style space   

 

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