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Konsentrasi H+ dalam 250 mL larutan yang mengandung 2,3 gram asam format (HCOOH) adalah ...

Pertanyaan

Konsentrasi H+ dalam 250 mL larutan yang mengandung 2,3 gram asam format (HCOOH) adalah ... 

left parenthesis K subscript a equals 1 comma 8 cross times 10 to the power of negative sign 4 end exponent comma space A subscript r space C equals 12 comma space H equals 1 comma space O equals 16 right parenthesis space 

Pembahasan Soal:

Perhitungan mencari mol HCOOH

table attributes columnalign right center left columnspacing 0px end attributes row cell n space H C O O H end cell equals cell massa over Mr end cell row blank equals cell fraction numerator 2 comma 3 space gram over denominator 46 space g space mol to the power of negative sign 1 end exponent end fraction end cell row blank equals cell 0 comma 05 space mol end cell end table 


Perhitungan mencari konsentrasi HCOOH

table attributes columnalign right center left columnspacing 0px end attributes row cell M space H C O O H end cell equals cell n over V end cell row blank equals cell fraction numerator 0 comma 05 space mol over denominator 0 comma 25 space L end fraction end cell row blank equals cell 0 comma 2 space M end cell end table 


Perhitungan mencari konsentrasi H+

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 0 comma 2 end root end cell row blank equals cell square root of 36 cross times 10 to the power of negative sign 6 end exponent end root end cell row blank equals cell 6 cross times 10 to the power of negative sign 3 end exponent end cell end table  


Jadi, konsentrasi H to the power of plus sign sebesar 6 cross times 10 to the power of negative sign 3 end exponent.space 

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 02 Juni 2021

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