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Besarnya pH larutan asam metanoat 0,01 M adalah 5. Harga tetapan asam metanoat tersebut adalah .

Pertanyaan

Besarnya pH larutan asam metanoat 0,01 M adalah 5. Harga tetapan asam metanoat tersebut adalah horizontal ellipsis.

  1. begin mathsize 14px style 1 cross times 10 to the power of negative sign 5 end exponent end style 

  2. begin mathsize 14px style 1 cross times 10 to the power of negative sign 6 end exponent end style 

  3. begin mathsize 14px style 1 cross times 10 to the power of negative sign 7 end exponent end style 

  4. begin mathsize 14px style 1 cross times 10 to the power of negative sign 8 end exponent end style 

  5. begin mathsize 14px style 2 cross times 10 to the power of negative sign 8 end exponent end style 

Pembahasan Soal:

begin mathsize 14px style pH equals minus sign log open square brackets H to the power of plus sign close square brackets open square brackets H to the power of plus sign close square brackets equals 10 to the power of negative sign pH end exponent open square brackets H to the power of plus sign close square brackets equals 10 to the power of negative sign 5 end exponent  open square brackets H to the power of plus sign close square brackets equals square root of K subscript a cross times open square brackets H C O O H close square brackets end root K subscript a equals fraction numerator open square brackets H to the power of plus sign close square brackets squared over denominator open square brackets H C O O H close square brackets end fraction K subscript a equals fraction numerator open parentheses 10 to the power of negative sign 5 end exponent close parentheses squared over denominator 0 comma 01 end fraction K subscript a equals 10 to the power of negative sign 8 end exponent end style

Dengan demikian, maka jawaban yang tepat adalah D.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 03 April 2021

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