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Sebanyak 19,6 gram garam   dilarutkan dalam air hi...

Sebanyak 19,6 gram garam begin mathsize 14px style C H subscript 3 C O O K end style begin mathsize 14px style left parenthesis italic M subscript r equals 98 right parenthesis end style dilarutkan dalam air hingga volumenya 500 mL, Error converting from MathML to accessible text.. pH larutan begin mathsize 14px style C H subscript 3 C O O K end style adalah ...

  1. 2 - log 5      space 

  2. 4 - log 5      space 

  3. 5 - log 2      space 

  4. 9 + log 2      space 

  5. 10 + log 5    space 

Jawaban:

begin mathsize 14px style open square brackets G close square brackets equals massa over italic M subscript r cross times fraction numerator 1000 over denominator V space open parentheses mL close parentheses end fraction open square brackets G close square brackets equals fraction numerator 19 comma 6 over denominator 98 end fraction cross times 1000 over 500 open square brackets G close square brackets equals 0 comma 4 space M end style 
 

begin mathsize 14px style 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 G close square brackets cross times valensi end root open square brackets O H to the power of minus sign close square brackets 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 0 comma 4 cross times 1 end root open square brackets O H to the power of minus sign close square brackets equals square root of 4 cross times 10 to the power of negative sign 10 end exponent end root open square brackets O H to the power of minus sign close square brackets equals 2 cross times 10 to the power of negative sign 5 end exponent  pOH equals minus sign log space open square brackets O H to the power of minus sign close square brackets pOH equals minus sign log space 2 cross times 10 to the power of negative sign 5 end exponent pOH equals 5 minus sign log space 2  pH equals 14 minus sign pOH pH equals 14 minus sign left parenthesis 5 minus sign log space 2 right parenthesis pH equals 9 plus log space 2 end style 
 

Jadi, jawaban yang sesuai adalah D.space  

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