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Untuk membuat larutan penyangga yang mempunyai pH = 4 ke dalam 100 mL larutan CH 3 COOH 0,5 M (Ka = 1 x 10 -5 ) harus ditambahkan larutan CH 3 COONa 0,5 M sebanyak…

Untuk membuat larutan penyangga yang mempunyai pH = 4 ke dalam 100 mL larutan CH3COOH 0,5 M (Ka = 1 x 10-5) harus ditambahkan larutan CH3COONa 0,5 M sebanyak…

  1. 100 mL

  2. 50 mL

  3. 10 mL

  4. 5 mL

  5. 1 mL

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J. Siregar

Master Teacher

Mahasiswa/Alumni Universitas Negeri Medan

Jawaban terverifikasi

Pembahasan

Diketahui: pH = 4 ; Ditanya: Volume ...? Dijawab: pH = 4 , berarti penyangga bersifat asam. pH = 4, makanilai H + = 10 -4

Diketahui: pH = 4 ; begin mathsize 12px style K subscript a space C H subscript 3 C O O H space equals space 1 space x space 10 to the power of negative 5 end exponent end style

                 begin mathsize 12px style left square bracket C H subscript 3 C O O H right square bracket space equals space 0 comma 5 space M space semicolon space V o l u m e space C H subscript 3 C O O H space equals space 100 space m L space end style

                 begin mathsize 12px style left square bracket C H subscript 3 C O O N a right square bracket space equals space 0 comma 5 space M space end style

Ditanya: Volume begin mathsize 12px style C H subscript 3 C O O N a end style ...?

Dijawab: 

pH = 4 , berarti penyangga bersifat asam.

pH = 4, maka nilai H+ = 10-4

begin mathsize 12px style n space C H subscript 3 C O O H space equals space M space x space V equals space 0 comma 5 space M space x space 100 space m L space equals space 50 space m m o l space n space C H subscript 3 C O O N a space equals space M space x space V space equals space 0 comma 5 space x space V space equals space 0 comma 5 V space m m o l space end style

size 12px left square bracket size 12px H to the power of size 12px plus size 12px right square bracket size 12px space size 12px equals size 12px space size 12px K subscript size 12px a size 12px space end subscript size 12px x size 12px space fraction numerator size 12px n size 12px space size 12px C size 12px H subscript size 12px 3 size 12px C size 12px O size 12px O size 12px H over denominator size 12px n size 12px space size 12px C size 12px H subscript size 12px 3 size 12px C size 12px O size 12px O size 12px N size 12px a end fraction size 12px left square bracket size 12px H to the power of size 12px plus size 12px right square bracket size 12px space size 12px equals size 12px space size 12px 1 size 12px space size 12px x size 12px space size 12px 10 to the power of size 12px minus size 12px 5 end exponent size 12px space size 12px x size 12px space fraction numerator size 12px 50 size 12px space size 12px m size 12px m size 12px o size 12px l size 12px space over denominator size 12px 0 size 12px comma size 12px 5 size 12px space size 12px V size 12px space size 12px m size 12px m size 12px o size 12px l size 12px space end fraction size 12px 1 size 12px space size 12px x size 12px space size 12px 10 to the power of size 12px minus size 12px 4 end exponent size 12px space size 12px equals size 12px space size 12px 1 size 12px space size 12px x size 12px space size 12px 10 to the power of size 12px minus size 12px 5 end exponent size 12px space size 12px x size 12px space fraction numerator size 12px 50 size 12px space size 12px m size 12px m size 12px o size 12px l size 12px space over denominator size 12px 0 size 12px comma size 12px 5 size 12px space size 12px V size 12px space size 12px m size 12px m size 12px o size 12px l size 12px space end fraction fraction numerator size 12px 1 size 12px space size 12px x size 12px space size 12px 10 to the power of size 12px minus size 12px 4 end exponent over denominator size 12px 1 size 12px space size 12px x size 12px space size 12px 10 to the power of size 12px minus size 12px 5 end exponent end fraction size 12px space size 12px equals size 12px space size 12px 100 over size 12px v size 12px space size 12px v size 12px space size 12px equals size 12px space size 12px 10 size 12px space size 12px m size 12px L size 12px space size 12px M size 12px a size 12px k size 12px a size 12px comma size 12px space size 12px v size 12px o size 12px l size 12px u size 12px m size 12px e size 12px space size 12px C size 12px H subscript size 12px 3 size 12px C size 12px O size 12px O size 12px N size 12px a size 12px space size 12px a size 12px d size 12px a size 12px l size 12px a size 12px h size 12px space size 12px 10 size 12px space size 12px m size 12px L size 12px. size 12px space  

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