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Sebanyak x gram HCOOH ( Mr = 46 ) dilarutkan dalam air hingga volume 0 , 5 dm 3 . Jika pH HCOOH = 3 − lo g 2 , Ka HCOOH = 2 × 1 0 − 4 , tentukan nilai dari X?

Sebanyak x gram  dilarutkan dalam air hingga volume . Jika , , tentukan nilai dari X?

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nilai x adalah 0,46 gram.

nilai x adalah 0,46 gram.

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Langkah pertama, menentukan nilai Langkah kedua, menentukan molaritas Langkah ketiga, menentukan nilai mol HCOOH Langkah keempat, menentukan x gram Jadi, nilai x adalah 0,46 gram.

Langkah pertama, menentukan nilai bold left square bracket bold H to the power of bold plus bold right square bracket

table attributes columnalign right center left columnspacing 0px end attributes row cell pH space H C O O H end cell equals cell negative sign log open square brackets H to the power of plus sign close square brackets end cell row cell space space space space space 3 minus sign log space 2 end cell equals cell negative sign log open square brackets H to the power of plus sign close square brackets end cell row cell space space space space space space space space space space space open square brackets H to the power of plus sign close square brackets end cell equals cell 2 cross times 10 to the power of negative sign 3 end exponent space M end cell end table

Langkah kedua, menentukan molaritas H C O O H

table attributes columnalign right center left columnspacing 0px end attributes row blank blank blank 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 point open square brackets H C O O H close square brackets end root end cell row cell 2 cross times 10 to the power of negative sign 3 end exponent end cell equals cell square root of 2 cross times 10 to the power of negative sign 4 end exponent point open square brackets H C O O H close square brackets end root end cell row cell 4 cross times 10 to the power of negative sign 6 end exponent end cell equals cell 2 cross times 10 to the power of negative sign 4 end exponent point open square brackets H C O O H close square brackets end cell row cell open square brackets H C O O H close square brackets end cell equals cell fraction numerator 4 cross times 10 to the power of negative sign 6 end exponent over denominator 2 cross times 10 to the power of negative sign 4 end exponent end fraction end cell row blank equals cell 2 cross times 10 to the power of negative sign 2 end exponent space M end cell row blank blank blank end table

Langkah ketiga, menentukan nilai 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 M cross times V end cell row cell space space space space space space space space space space space space space space end cell equals cell 2 cross times 10 to the power of negative sign 2 end exponent cross times 0 comma 5 space dm cubed end cell row cell space space space space space space space space space space space space space space end cell equals cell 10 to the power of negative sign 2 end exponent space mol end cell end table 

Langkah keempat, menentukan x gram  H C O O H

table attributes columnalign right center left columnspacing 0px end attributes row cell massa space HCOOH end cell equals cell straight n cross times Mr end cell row cell space space space space space space space space space space space space space space space space space space space space space space end cell equals cell 10 to the power of negative 2 end exponent cross times 46 end cell row cell space space space space space space space space space space space space space space space space space space space space space space end cell equals cell 0 comma 46 space gram end cell end table

Jadi, nilai x adalah 0,46 gram.

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