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Sebanyak 100 mL larutan mengandung 0,52 gram kalsium format (Mr​ = 130 g mol−1). Jika Ka​ asam format 2×10−4, molaritas H+ dalam larutan garam tersebut adalah ....

Pertanyaan

Sebanyak 100 mL larutan mengandung 0,52 gram kalsium format (begin mathsize 14px style italic M subscript r space equals space 130 space g space mol to the power of negative sign 1 end exponent end style). Jika begin mathsize 14px style K subscript a end style asam format begin mathsize 14px style 2 cross times 10 to the power of negative sign 4 end exponent end style, molaritas begin mathsize 14px style H to the power of plus sign end style dalam larutan garam tersebut adalah ....space 

  1. begin mathsize 14px style 2 cross times 10 to the power of negative sign 9 end exponent end style undefined 

  2. begin mathsize 14px style 5 cross times 10 to the power of negative sign 9 end exponent end style undefined 

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

  4. begin mathsize 14px style 4 cross times 10 to the power of negative sign 6 end exponent end style undefined 

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

A. Acfreelance

Master Teacher

Jawaban terverifikasi

Jawaban

jawaban yang benar adalah B.

Pembahasan

Garam basa adalah garam yang terbentuk dari basa kuat yang tepat bereaksi dengan asam lemah, kedua pereaksi tepat habis tak bersisa.

  • Konsentrasi Ca open parentheses H C O O close parentheses subscript 2

table attributes columnalign right center left columnspacing 0px end attributes row cell M space end cell equals cell space m over Mr cross times 1000 over V end cell row blank equals cell space fraction numerator 0 comma 52 over denominator 130 end fraction cross times 1000 over 100 end cell row blank equals cell space 4 cross times 10 to the power of negative sign 2 end exponent space M end cell end table

  • Sifat Garam

Ca open parentheses H C O O close parentheses subscript 2, berasal dari asam lemah yaitu HCOOH dan basa kuat yaitu Ca open parentheses O H close parentheses subscript 2, sehingga bersifat garam basa.

  • open square brackets H C O O to the power of minus sign close square brackets

Ca open parentheses H C O O close parentheses subscript 2 space rightwards arrow space Ca to the power of 2 plus sign space plus space 2 space H C O O to the power of minus sign 4 cross times 10 to the power of negative sign 2 end exponent space space space space space space space space space space space space space space space space space space space space space space space space space space space 8 cross times 10 to the power of negative sign 2 end exponent

  • open square brackets O H to the power of minus sign close square brackets

table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell square root of K subscript italic w over K subscript italic a cross times space open square brackets H C O O to the power of minus sign close square brackets end root end cell row blank equals cell square root of fraction numerator 10 to the power of negative sign 14 end exponent over denominator 2 cross times 10 to the power of negative sign 4 end exponent end fraction cross times space 8 cross times 10 to the power of negative sign 2 end exponent end root end cell row blank equals cell square root of 4 cross times 10 to the power of negative sign 12 end exponent end root end cell row blank equals cell space 2 cross times 10 to the power of negative sign 6 end exponent end cell end table

  • open square brackets H to the power of plus sign close square brackets

table attributes columnalign right center left columnspacing 0px end attributes row cell K subscript w space end cell equals cell space open square brackets H to the power of plus sign close square brackets cross times open square brackets O H to the power of minus sign close square brackets end cell row cell 1 cross times 10 to the power of negative sign 14 end exponent space end cell equals cell space open square brackets H to the power of plus sign close square brackets cross times space 2 cross times 10 to the power of negative sign 6 end exponent end cell row cell open square brackets H to the power of plus sign close square brackets space end cell equals cell space fraction numerator 1 cross times 10 to the power of negative sign 14 end exponent over denominator 2 cross times 10 to the power of negative sign 6 end exponent end fraction end cell row blank equals cell space 5 cross times 10 to the power of negative sign 9 end exponent end cell end table

Jadi, nilai open square brackets H to the power of plus sign close square brackets adalah 5 cross times 10 to the power of negative sign 6 end exponent.

Jadi, jawaban yang benar adalah B.

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