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Pertanyaan

Sebaiknya, berapa gram CH 3 ​ COONa yang harus ditimbang agar diperoleh pH larutan garam sebesar 8 di dalam 500 mL larutan? (Mr = 82 dan K a ​ CH 3 ​ COOH = 1 0 − 5 )

Sebaiknya, berapa gram  yang harus ditimbang agar diperoleh pH larutan garam begin mathsize 14px style C H subscript 3 C O O Na end style sebesar 8 di dalam 500 mL larutan?

(Mr  begin mathsize 14px style C H subscript 3 C O O Na end style = 82 dan )

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S. Lubis

Master Teacher

Mahasiswa/Alumni Universitas Sumatera Utara

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Pembahasan

Untuk menghitung pH larutan garam , digunakan rumus hidrolisis garam bersifat basa, yaitu : Maka, massa larutan garam CH 3 COONaadalah 0,041 gram.

Untuk menghitung pH larutan garam begin mathsize 14px style C H subscript 3 C O O Na end style, digunakan rumus hidrolisis garam bersifat basa, yaitu :

begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets equals square root of K subscript w over K subscript a open square brackets C H subscript 3 C O O Na close square brackets end root end style 

begin mathsize 14px style pH space C H subscript 3 C O O Na equals 8 pH and pOH equals 14 pOH equals 14 minus sign 8 equals 6 pOH equals minus sign log space open square brackets O H to the power of minus sign close square brackets 6 equals minus sign log space open square brackets O H to the power of minus sign close square brackets open square brackets O H to the power of minus sign close square brackets equals 10 to the power of negative sign 6 end exponent end style          begin mathsize 14px style 10 to the power of negative sign 6 end exponent equals square root of 10 to the power of negative sign 14 end exponent over 10 to the power of negative sign 5 end exponent open square brackets C H 3 C O O Na close square brackets end root open square brackets C H 3 C O O Na close square brackets equals 10 to the power of negative sign 3 end exponent space M M equals gram over Mr cross times 1000 over mL 10 to the power of negative sign 3 end exponent equals x over 82 cross times 1000 over 500 x equals 4 comma 1 cross times 10 to the power of negative sign 2 end exponent equals 0 comma 041 space gram end style 

Maka, massa larutan garam CH3COONa adalah 0,041 gram. 

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Pertanyaan serupa

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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