Roboguru

Jika diketahui , maka pH larutan  0,8 M. (log 2 = 0,3)

Pertanyaan

Jika diketahui begin mathsize 14px style K subscript a space C H subscript 3 C O O H equals 10 to the power of negative sign 5 end exponent end style, maka pH larutan begin mathsize 14px style Ca open parentheses C H subscript 3 C O O close parentheses subscript 2 end style 0,8 M. (log 2 = 0,3)space 

  1. 8,1space 

  2. 8,2space 

  3. 8,3space 

  4. 8,4space 

  5. 8,5space 

Pembahasan Soal:

Senyawa begin mathsize 14px style Ca open parentheses C H subscript 3 C O O close parentheses subscript 2 end style merupakan garam basa yang mampu terhidrolisis sebagian. Untuk mencari pH larutan garam tersebut dapat menggunakan rumus:


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 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 cross times open square brackets C H subscript 3 C O O to the power of minus sign close square brackets end root equals square root of K subscript w over K subscript a cross times open parentheses 2 cross times open square brackets Ca open parentheses C H subscript 3 C O O close parentheses subscript 2 close square brackets close parentheses end root 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 cross times 2 cross times 0 comma 8 end root equals square root of 16 cross times 10 to the power of negative sign 10 end exponent end root equals 4 cross times 10 to the power of negative sign 5 end exponent end cell row blank blank blank row blank blank cell pOH equals minus sign log space open square brackets O H to the power of minus sign close square brackets equals minus sign log space 4 cross times 10 to the power of negative sign 5 end exponent equals 5 minus sign log space 4 equals 5 minus sign log space 2 squared equals 5 minus sign left parenthesis 2 space log space 2 right parenthesis equals 5 minus sign 0 comma 6 equals 4 comma 4 end cell row blank blank blank row blank blank cell pH equals 14 minus sign pOH equals 14 minus sign 4 comma 4 equals 9 comma 6 end cell end table end style 


Jadi, tidak ada pilihan jawaban yang sesuai, karena pH larutan begin mathsize 14px style Ca open parentheses C H subscript 3 C O O close parentheses subscript 2 end style 0,8 M sebesar 9,8.space 

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 15 Maret 2021

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