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Perhatikan tabel larutan penyangga beserta komposisinya berikut! Diketahui Ka HNO 2 ​ = 4 , 5 × 1 0 − 4 . Urutan harga pH mulai dari yang terkecil hingga terbesar adalah ....

Perhatikan tabel larutan penyangga beserta komposisinya berikut!


 


Diketahui . Urutan harga pH mulai dari yang terkecil hingga terbesar adalah ....

  1. begin mathsize 14px style 1 comma space 2 comma space 3 end style 

  2. begin mathsize 14px style 1 comma space 3 comma space 2 end style 

  3. begin mathsize 14px style 2 comma space 1 comma space 3 end style 

  4. begin mathsize 14px style 2 comma space 3 comma space 1 end style 

  5. begin mathsize 14px style 3 comma space 2 comma space 1 end style 

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M. Juliana

Master Teacher

Mahasiswa/Alumni Universitas Negeri Medan

Jawaban terverifikasi

Jawaban

jawaban yang benar adalah E.

jawaban yang benar adalah E.

Pembahasan

Untuk menentukan pH asam lemah dan garamnya dapat menggunakan rumus: Penentuan pH larutan penyangga 1: Penentuan pH larutan penyangga 2: Penentuan pH larutan penyangga 3: pH dari yang yang terkecil hingga terbesar adalah larutan nomor 3, 2 dan 1. Jadi, jawaban yang benar adalah E.

Untuk menentukan pH asam lemah dan garamnya dapat menggunakan rumus:


begin mathsize 14px style open square brackets H to the power of plus sign close square brackets equals K subscript a cross times fraction numerator asam over V over denominator garam over V end fraction end style 


Penentuan pH larutan penyangga 1:


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell V subscript asam end cell equals cell 10 space ml end cell row cell V subscript garam end cell equals cell 10 space ml end cell row cell M subscript asam end cell equals cell 0 comma 02 space M end cell row cell M subscript garam end cell equals cell 0 comma 01 space M end cell row cell K subscript a end cell equals cell 4 comma 5 cross times 10 to the power of negative sign 4 end exponent end cell 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 asam over V over denominator garam over V end fraction end cell row blank equals cell left parenthesis 4 comma 5 cross times 10 to the power of negative sign 4 end exponent right parenthesis cross times fraction numerator fraction numerator 0 comma 02 space M over denominator 10 space ml end fraction over denominator fraction numerator 0 comma 01 space M over denominator 10 space ml end fraction end fraction end cell row blank equals cell left parenthesis 4 comma 5 cross times 10 to the power of negative sign 4 end exponent right parenthesis cross times fraction numerator 0 comma 002 space mmol over denominator 0 comma 001 space mmol end fraction end cell row blank equals cell 9 cross times 10 to the power of negative sign 4 end exponent end cell row blank blank blank row pH equals cell negative sign log space H to the power of plus sign end cell row blank equals cell negative sign log space 9 cross times 10 to the power of negative sign 4 end exponent end cell row blank equals cell 4 minus sign log space 9 end cell row blank equals cell 4 minus sign 0 comma 954 end cell row blank equals cell 3 comma 046 end cell end table end style  


Penentuan pH larutan penyangga 2:


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell V subscript asam end cell equals cell 10 space ml end cell row cell V subscript garam end cell equals cell 10 space ml end cell row cell M subscript asam end cell equals cell 0 comma 04 space M end cell row cell M subscript garam end cell equals cell 0 comma 01 space M end cell row cell K subscript a end cell equals cell 4 comma 5 cross times 10 to the power of negative sign 4 end exponent end cell 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 asam over V over denominator garam over V end fraction end cell row blank equals cell left parenthesis 4 comma 5 cross times 10 to the power of negative sign 4 end exponent right parenthesis cross times fraction numerator fraction numerator 0 comma 04 space M over denominator 10 space ml end fraction over denominator fraction numerator 0 comma 01 space M over denominator 10 space ml end fraction end fraction end cell row blank equals cell left parenthesis 4 comma 5 cross times 10 to the power of negative sign 4 end exponent right parenthesis cross times fraction numerator 0 comma 004 space mmol over denominator 0 comma 001 space mmol end fraction end cell row blank equals cell 1 comma 8 cross times 10 to the power of negative sign 3 end exponent end cell row blank blank blank row pH equals cell negative sign log space H to the power of plus sign end cell row blank equals cell negative sign log space 1 comma 8 cross times 10 to the power of negative sign 3 end exponent end cell row blank equals cell 3 minus sign log space 1 comma 8 end cell row blank equals cell 3 minus sign 0 comma 255 end cell row blank equals cell 2 comma 745 end cell end table end style  


Penentuan pH larutan penyangga 3:


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell V subscript asam end cell equals cell 10 space ml end cell row cell V subscript garam end cell equals cell 10 space ml end cell row cell M subscript asam end cell equals cell 0 comma 06 space M end cell row cell M subscript garam end cell equals cell 0 comma 01 space M end cell row cell K subscript a end cell equals cell 4 comma 5 cross times 10 to the power of negative sign 4 end exponent end cell 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 asam over V over denominator garam over V end fraction end cell row blank equals cell left parenthesis 4 comma 5 cross times 10 to the power of negative sign 4 end exponent right parenthesis cross times fraction numerator fraction numerator 0 comma 06 space M over denominator 10 space ml end fraction over denominator fraction numerator 0 comma 01 space M over denominator 10 space ml end fraction end fraction end cell row blank equals cell left parenthesis 4 comma 5 cross times 10 to the power of negative sign 4 end exponent right parenthesis cross times fraction numerator 0 comma 006 space mmol over denominator 0 comma 001 space mmol end fraction end cell row blank equals cell 2 comma 7 cross times 10 to the power of negative sign 3 end exponent end cell row blank blank blank row pH equals cell negative sign log space H to the power of plus sign end cell row blank equals cell negative sign log space 2 comma 7 cross times 10 to the power of negative sign 3 end exponent end cell row blank equals cell 3 minus sign log space 2 comma 7 end cell row blank equals cell 3 minus sign 0 comma 431 end cell row blank equals cell 2 comma 56 end cell end table end style 
 

pH dari yang yang terkecil hingga terbesar adalah larutan nomor 3, 2 dan 1.

Jadi, jawaban yang benar adalah E.

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