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Campuran dari 10 mL larutan 0,1 M dengan 40 mL 0,1 M () mempunyai nilai pH ....

Campuran dari 10 mL larutan begin mathsize 14px style H subscript 2 S O subscript 4 end style 0,1 M dengan 40 mL begin mathsize 14px style N H subscript 3 end style 0,1 M (begin mathsize 14px style K subscript b space N H subscript 3 equals 2 cross times 10 to the power of negative sign 5 end exponent end style) mempunyai nilai pH ....

  1. begin mathsize 14px style 5 minus log 4 end style 

  2. begin mathsize 14px style 5 plus log 4 end style 

  3. begin mathsize 14px style 6 minus log 4 end style 

  4. begin mathsize 14px style 9 minus log 4 end style 

  5. begin mathsize 14px style 9 plus log 4 end style 

Jawaban:

Untuk larutan buffer yang dibuat dari asam/basa kuat dengan basa/asam lemah berlebih harus direaksikan terlebih dahulu.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell n subscript N H subscript 3 end subscript end cell equals cell 0 comma 1 M cross times 40 space mL end cell row blank equals cell 4 space mmol end cell row blank equals cell 0 comma 004 space mol end cell row cell n subscript H subscript 2 S O subscript 4 end subscript end cell equals cell 0 comma 1 M cross times 10 space mL end cell row blank equals cell 1 space mmol end cell row blank equals cell 0 comma 001 space mol end cell row blank blank blank end table end style   

 

  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 K subscript b cross times fraction numerator n subscript N H subscript 3 end subscript over denominator n subscript open parentheses N H subscript 4 close parentheses subscript 2 S O subscript 4 end subscript cross times v end fraction end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell 2 cross times 10 to the power of negative sign 5 end exponent cross times fraction numerator 0 comma 002 space mol over denominator 0 comma 001 space mol cross times 2 end fraction end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell 2 cross times 10 to the power of negative sign 5 end exponent space M end cell row blank blank blank row pOH equals cell negative sign log open square brackets O H to the power of minus sign close square brackets end cell row pOH equals cell negative sign log left parenthesis 2 cross times 10 to the power of negative sign 5 end exponent right parenthesis end cell row pOH equals cell 5 minus sign log 2 end cell row blank blank blank row pH equals cell 14 minus sign pOH end cell row pH equals cell 14 minus sign open parentheses 5 minus sign log 2 close parentheses end cell row pH equals cell 9 plus log 2 end cell row blank blank blank end table end style  

Jadi, pH campuran yang terbentuk sebesar 9+log2, jawaban yang benar tidak ada di opsi jawaban.undefined

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