Roboguru

HCOOH merupakan asam lemah . pH larutan HCOOH 0,5 M adalah ....

HCOOH merupakan asam lemah begin mathsize 14px style open parentheses K subscript a equals 1 comma 8 cross times 10 to the power of negative sign 5 end exponent close parentheses end style. pH larutan HCOOH 0,5 M adalah ....space

  1. 6 - log 2space

  2. 5 - log 4space

  3. 4 - log 5space

  4. 3 - log 3space

  5. 2 - log 6space

Jawaban:

begin mathsize 14px style open square brackets H to the power of plus sign close square brackets equals square root of Ka cross times open square brackets H C O O H close square brackets end root open square brackets H to the power of plus sign close square brackets equals square root of 1 comma 8 cross times 10 to the power of negative sign 5 end exponent cross times 0 comma 5 end root open square brackets H to the power of plus sign close square brackets equals square root of 9 cross times 10 to the power of negative sign 6 end exponent end root open square brackets H to the power of plus sign close square brackets equals 3 cross times 10 to the power of negative sign 3 end exponent space M pH equals minus sign log space open square brackets H to the power of plus sign close square brackets pH equals minus sign log space open parentheses 3 cross times 10 to the power of negative sign 3 end exponent close parentheses pH equals bold 3 bold minus sign bold log bold space bold 3 end style


Jadi, jawaban yang tepat adalah D.space

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