Roboguru

Berapakah pH larutan yang terbuat dari campuran  dan ? Diketahui

Pertanyaan

Berapakah pH larutan yang terbuat dari campuran begin mathsize 14px style 100 space mL space C H subscript 3 C O O H space 0 comma 01 space M end style dan begin mathsize 14px style 100 space mL space Na O H space 0 comma 01 space M end style? Diketahui begin mathsize 14px style K subscript a space СН subscript З СООH equals 5 cross times 10 to the power of negative sign 5 end exponent end style 

Pembahasan Soal:

  • Menghitung mol C H subscript 3 C O O H:

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 blank equals cell 0 comma 01 space M cross times 100 space mL end cell row blank equals cell 1 space mmol end cell end table 

 

  • Menghitung mol Na O H:

table attributes columnalign right center left columnspacing 0px end attributes row cell n space Na O H end cell equals cell M cross times v end cell row blank equals cell 0 comma 01 space M cross times 100 space mL end cell row blank equals cell 1 space mmol end cell end table 
 

  • Masukkan ke tabel M R S:

 
 

Pada tabel, asam lemah (C H subscript 3 C O O H) dan basa kuat open parentheses Na O H close parentheses habis bereaksi. Reaksi tersebut mengalami reaksi hidrolisis garam basa.

  • Menghitung open square brackets O H to the power of minus sign close square brackets space C H subscript 3 C O O Na:

table attributes columnalign right center left columnspacing 0px end attributes 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 w over K subscript a cross times open square brackets C H subscript 3 C O O Na close square brackets cross times valensi end root end cell row blank equals cell square root of fraction numerator 10 to the power of negative sign 14 end exponent over denominator 5 cross times 10 to the power of negative sign 5 end exponent end fraction cross times fraction numerator 1 space mmol over denominator 200 space mL end fraction cross times 1 end root end cell row blank equals cell square root of fraction numerator 10 to the power of negative sign 14 end exponent over denominator 5 cross times 10 to the power of negative sign 5 end exponent end fraction cross times 5 cross times 10 to the power of negative sign 3 end exponent cross times 1 end root end cell row blank equals cell square root of 10 to the power of negative sign 12 end exponent end root end cell row blank equals cell 10 to the power of negative sign 6 end exponent end cell end table 
 

  • Menghitung pOH:

table attributes columnalign right center left columnspacing 0px end attributes row pOH equals cell negative sign log space 10 to the power of negative sign 6 end exponent end cell row blank equals 6 end table 

  • Menghitung pH:

table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell 14 minus sign pOH end cell row blank equals cell 14 minus sign 6 end cell row blank equals 8 end table 


Jadi, pH larutan yang terbentuk adalah 8.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 04 Mei 2021

RUANGGURU HQ

Jl. Dr. Saharjo No.161, Manggarai Selatan, Tebet, Kota Jakarta Selatan, Daerah Khusus Ibukota Jakarta 12860

Coba GRATIS Aplikasi Ruangguru

Produk Ruangguru

Produk Lainnya

Hubungi Kami

Ikuti Kami

©2021 Ruangguru. All Rights Reserved