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Sebanyak 4,1 gram CH 3 ​ COONa dilarutkan dalam air hingga volume larutan 500 mL ( A r ​ C = 12 , H = 1 , O = 16 , Na = 23 ). Bila derajat hidrolisis larutan yang terjadi adalah 1 0 − 4 , berapakah pH larutan tersebut?

Sebanyak 4,1 gram  dilarutkan dalam air hingga volume larutan 500 mL (). Bila derajat hidrolisis larutan yang terjadi adalah , berapakah pH larutan tersebut? undefined

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J. Siregar

Master Teacher

Mahasiswa/Alumni Universitas Negeri Medan

Jawaban terverifikasi

Jawaban

pH larutan garam adalah 9.

pH larutan garam begin mathsize 14px style C H subscript 3 C O O Na end style adalah 9.

Pembahasan

adalah garam yang bersifat basa yang dapat menghasilkan ion pada reaksi hidrolisisnya. Hitung konsentrasi molar . Konversi nilaiderajat hidrolisis (h) untuk menentukan . Hitung pH. Jadi, pH larutan garam adalah 9.

begin mathsize 14px style C H subscript 3 C O O Na end style adalah garam yang bersifat basa yang dapat menghasilkan ion begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets end style pada reaksi hidrolisisnya.

begin mathsize 14px style C H subscript 3 C O O Na yields C H subscript 3 C O O to the power of minus sign and Na to the power of plus sign C H subscript 3 C O O to the power of minus sign and H subscript 2 O equilibrium C H subscript 3 C O O H and O H to the power of minus sign Na to the power of plus sign and H subscript 2 O yields tidak space terhidrolisis end style 

  • Hitung konsentrasi molar begin mathsize 14px style C H subscript 3 C O O Na end style.

begin mathsize 14px style open square brackets C H subscript 3 C O O Na close square brackets equals m over Mr cross times 1000 over V open square brackets C H subscript 3 C O O Na close square brackets equals fraction numerator 4 comma 1 over denominator 82 end fraction cross times 1000 over 500 open square brackets C H subscript 3 C O O Na close square brackets equals 0 comma 1 space M end style 

  • Konversi nilai derajat hidrolisis (h) untuk menentukan begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets end style.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row h equals cell square root of fraction numerator K subscript h over denominator open square brackets Garam close square brackets end fraction end root end cell row cell K subscript h end cell equals cell h squared cross times open square brackets Garam close square brackets end cell row blank blank blank 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 h cross times open square brackets Garam close square brackets cross times valensi end root end cell row blank equals cell square root of h squared cross times open square brackets Garam close square brackets cross times open square brackets Garam close square brackets cross times valensi end root end cell row blank equals cell square root of h squared cross times open square brackets Garam close square brackets squared cross times valensi end root end cell row blank equals cell square root of left parenthesis 10 to the power of negative sign 4 end exponent right parenthesis squared cross times left parenthesis 0 comma 1 right parenthesis squared cross times 1 end root end cell row blank equals cell square root of 10 to the power of negative sign 10 end exponent end root end cell row blank equals cell 10 to the power of negative sign 5 end exponent end cell end table end style 

  • Hitung 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 10 to the power of negative sign 5 end exponent end cell row blank equals 5 row pH equals cell 14 minus sign pOH end cell row blank equals cell 14 minus sign 5 end cell row blank equals 9 end table end style 

Jadi, pH larutan garam begin mathsize 14px style C H subscript 3 C O O Na end style adalah 9.

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Hitunglah pH larutan CH 3 ​ COONa 0,008 M sebanyak 100 mL. Jika K a ​ CH 3 ​ COOH = 2 × 1 0 − 5 .

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