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Tentukan pH larutan penyangga yang dibuat dengan mencampurkan 100 mL larutan CH 3 ​ COOH 0,1 M dengan 50 mL larutan ( CH 3 ​ COO ) 2 ​ Ba 0,1 M. ( K a ​ CH 3 ​ COOH 2 × 1 0 − 5 )?

Tentukan pH larutan penyangga yang dibuat dengan mencampurkan 100 mL larutan  0,1 M dengan 50 mL larutan  0,1 M. ()? 

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J. Siregar

Master Teacher

Mahasiswa/Alumni Universitas Negeri Medan

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Jawaban

pH larutan penyangga tersebut adalah 5 - log 2.

pH larutan penyangga tersebut adalah 5 - log 2.

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Pembahasan

Hitung jumlah mol masing-masing zat. Menghitung pH larutan penyangga: Jadi, pH larutan penyangga tersebut adalah 5 - log 2.

  • Hitung jumlah mol masing-masing zat.

table attributes columnalign right center left columnspacing 0px end attributes row cell n space C H subscript 3 C O O H end cell equals cell M cross times V end cell row cell space space space space space space space space space space space space space space space space space space space space end cell equals cell 0 comma 1 space M cross times 100 space mL end cell row cell space space space space space space space space space space space space space space space space space space space space end cell equals cell 10 space mmol end cell row cell space space space space space space space space space space space space space space space space space space space space end cell equals cell 0 comma 01 space mol end cell row cell n space open parentheses C H subscript 3 C O O close parentheses subscript 2 Ba end cell equals cell M cross times V end cell row cell space space space space space space space space space space space space space space space space space space space space space space space space space end cell equals cell 0 comma 1 space M cross times 50 space mL end cell row cell space space space space space space space space space space space space space space space space space space space space space space space space space end cell equals cell 5 space mmol end cell row cell space space space space space space space space space space space space space space space space space space space space space space space space space end cell equals cell 0 comma 005 space mol end cell row cell space open parentheses C H subscript 3 C O O close parentheses subscript 2 Ba end cell rightwards arrow cell 2 C H subscript 3 C O O to the power of minus sign and Ba to the power of 2 plus sign end cell row cell n space C H subscript 3 C O O to the power of minus sign end cell equals cell 2 cross times n space open parentheses C H subscript 3 C O O close parentheses subscript 2 Ba end cell row cell space space space space space space space space space space space space space space space space space space space end cell equals cell 2 cross times 0 comma 005 space mol end cell row cell space space space space space space space space space space space space space space space space space space space end cell equals cell 0 comma 01 space mol end cell end table  

Menghitung pH larutan penyangga:

table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets H to the power of plus sign close square brackets end cell equals cell K subscript a cross times fraction numerator n space C H subscript 3 C O O H over denominator n space C H subscript 3 C O O to the power of minus sign end fraction end cell row cell space space space space space space end cell equals cell 2 cross times 10 to the power of negative sign 5 end exponent cross times fraction numerator 0 comma 01 space mol over denominator 0 comma 01 space mol end fraction end cell row cell space space space space space space end cell equals cell 2 cross times 10 to the power of negative sign 5 end exponent end cell row pH equals cell negative sign log space open square brackets H to the power of plus sign close square brackets end cell row cell space space space space end cell equals cell negative sign log space 2 cross times 10 to the power of negative sign 5 end exponent end cell row cell space space space space end cell equals cell 5 minus sign log space 2 end cell end table  

Jadi, pH larutan penyangga tersebut adalah 5 - log 2.

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