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Harga pH larutan HCOOH 0,01 M () adalah ....

Pertanyaan

Harga pH larutan HCOOH 0,01 M (begin mathsize 14px style K subscript a equals space 1 comma 8 cross times 10 to the power of negative sign 4 end exponent end style) adalah ....

  1. 3 - log 1,8undefined 

  2. 3 + log 1,8undefined 

  3. 1,8 - log 3undefined 

  4. 1,8 + log 3undefined 

  5. 3undefined 

Pembahasan Soal:

Nilai pH asam lemah ditentukan berdasarkan perhitungan berikut:

 

begin mathsize 14px style 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 square root of K subscript a cross times M subscript a end root end cell row blank equals cell square root of 1 comma 8 cross times 10 to the power of negative sign 4 end exponent cross times 10 to the power of negative sign 2 end exponent end root end cell row blank equals cell square root of 1 comma 8 end root 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 open square brackets H to the power of plus sign close square brackets end cell row blank equals cell negative sign log space square root of 1 comma 8 end root cross times 10 to the power of negative sign 3 end exponent end cell row blank equals cell 3 minus sign log space square root of 1 comma 8 end root end cell end table end style 


Tidak ada opsi jawaban yang benar.

Jadi, jawaban yang benar adalah begin mathsize 14px style 3 minus log square root of 1 comma 8 end root end style.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 13 Maret 2021

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