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Pertanyaan

Massa serbuk Fe ( OH ) 3 ​ yang harus dilarutkan untuk membuat 200 mL larutan basa dengan pH = 8 + log 9 sebanyak .... ( K b ​ Fe ( OH ) 3 ​ = 9 × 1 0 − 10 , M r ​ Fe ( OH ) 3 ​ = 107 g mol − 1 )

Massa serbuk  yang harus dilarutkan untuk membuat 200 mL larutan basa dengan pH = 8 + log 9 sebanyak ....    

  1. 1,926 gramspace 

  2. 2,568 gramundefined 

  3. 3,852 gramundefined 

  4. 4,494 gramundefined 

  5. 5,136 gramundefined 

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S. Lubis

Master Teacher

Jawaban terverifikasi

Jawaban

jawaban yang benar adalah A

jawaban yang benar adalah A

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Pembahasan

Pembahasan
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Tentukan M nya, Tentukan massanya, Jadi, jawaban yang benar adalah A

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals cell 8 plus log space 9 end cell row pOH equals cell 14 minus sign pH end cell row blank equals cell 14 minus sign left parenthesis 8 plus log space 9 right parenthesis end cell row blank equals cell 6 minus sign log space 9 end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell negative sign antilog space pOH end cell row blank equals cell negative sign antilog space 6 minus sign log space 9 end cell row blank equals cell 9 cross times 10 to the power of negative sign 6 end exponent end cell end table end style 

Tentukan M nya,

begin mathsize 14px style 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 Kb middle dot M end root end cell row cell 9 cross times 10 to the power of negative sign 6 end exponent end cell equals cell square root of 9 cross times 10 to the power of negative sign 10 end exponent middle dot M end root end cell row cell open parentheses 9 cross times 10 to the power of negative sign 6 end exponent close parentheses squared end cell equals cell open parentheses square root of 9 cross times 10 to the power of negative sign 10 end exponent middle dot M end root close parentheses squared end cell row cell 81 cross times 10 to the power of negative sign 12 end exponent end cell equals cell 9 cross times 10 to the power of negative sign 10 end exponent middle dot M end cell row M equals cell fraction numerator 81 cross times 10 to the power of negative sign 12 end exponent over denominator 9 cross times 10 to the power of negative sign 10 end exponent end fraction end cell row blank equals cell 9 cross times 10 to the power of negative sign 2 end exponent end cell end table end style

Tentukan massanya,

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row M equals cell massa over Mr cross times 1000 over pelarut end cell row cell 9 cross times 10 to the power of negative sign 2 end exponent end cell equals cell massa over 107 cross times 1000 over 200 end cell row cell 1000 space massa end cell equals cell 9 cross times 10 to the power of negative sign 2 end exponent space cross times space 107 space cross times space 200 end cell row massa equals cell 1 comma 926 space gram end cell end table end style

Jadi, jawaban yang benar adalah A

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Adela Kartika Putri

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Nilai pH larutan basa lemah LOH 0,1 M yang mempunyai nilai K b ​ = 1 × 1 0 − 5 adalah ....

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