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Pertanyaan

Sebanyak 100 mL larutan NH 4 ​ OH 0,06 M dicampurkan ke dalam 400 mL C 6 ​ H 5 ​ COOH 0,015 M yang pH-nya 3,5 - log 3. Jika pH larutan campuran sebesar 7 - log 2, pH larutan mula-mula adalah....

Sebanyak 100 mL larutan  0,06 M dicampurkan ke dalam 400 mL  0,015 M yang pH-nya 3,5 - log 3. Jika pH larutan campuran sebesar 7 - log 2, pH larutan begin mathsize 14px style N H subscript 4 O H end style  mula-mula adalah ....

  1. 7,5 + log 3

  2. 8,5 + log 3

  3. 9,5 - log 3

  4. 9,5 + log 3

  5. 10,5 + log 3

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Y. Rochmawatie

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Jawaban terverifikasi

Jawaban

jawaban yang benar adalah E.

jawaban yang benar adalah E.

Pembahasan

Pembahasan
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Karena dan merupakan asam dan basa lemah, maka nilai dan perlu dicari untuk memudahkan perhitungan pH Mencari . Mencari Menentukan pH larutan mula-mula Jadi, jawaban yang benar adalah E.

Karena Error converting from MathML to accessible text. dan begin mathsize 14px style N H subscript 4 O H end style merupakan asam dan basa lemah, maka nilai K subscript a dan K subscript b perlu dicari untuk memudahkan perhitungan pH

Mencari K subscript a Error converting from MathML to accessible text.

begin mathsize 14px style 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 space cross times space M end root end cell row cell 3 space cross times space 10 to the power of negative sign 3 comma 5 end exponent end cell equals cell square root of K subscript a space cross times space 1 comma 5 space cross times space 10 to the power of negative sign 2 end exponent end root end cell row cell 9 space cross times space 10 to the power of negative sign 7 end exponent end cell equals cell K subscript a space cross times space 1 comma 5 space cross times space 10 to the power of negative sign 2 end exponent end cell row cell K subscript a end cell equals cell 6 space cross times space 10 to the power of negative sign 5 end exponent end cell end table end style . 

Mencari K subscript b begin mathsize 14px style N H subscript 4 O H end style

begin mathsize 14px style 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 fraction numerator K subscript a space cross times space K subscript w over denominator K subscript b end fraction end root end cell row cell 2 space cross times space 10 to the power of negative sign 7 end exponent end cell equals cell square root of fraction numerator 6 space cross times space 10 to the power of negative sign 5 end exponent space cross times space 10 to the power of 14 over denominator K subscript b end fraction end root end cell row cell 4 space cross times space 10 to the power of negative sign 14 end exponent end cell equals cell fraction numerator 6 space cross times space 10 to the power of negative sign 5 end exponent space cross times space 10 to the power of negative sign 14 end exponent over denominator K subscript b end fraction end cell row Kb equals cell 1 comma 5 space cross times space 10 to the power of negative sign 5 end exponent end cell end table end style

Menentukan pH larutan begin mathsize 14px style N H subscript 4 O H end style mula-mula

begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets equals square root of K subscript b space cross times space M end root open square brackets O H to the power of minus sign close square brackets equals square root of 1 comma 5 space cross times space 10 to the power of negative sign 5 end exponent space cross times space 6 space cross times space 10 to the power of negative sign 2 end exponent end root open square brackets O H to the power of minus sign close square brackets equals square root of 9 space cross times space 10 to the power of negative sign 7 end exponent space end root open square brackets O H to the power of minus sign close square brackets equals 3 space cross times space 10 to the power of negative sign 3 comma 5 end exponent end style 

table attributes columnalign right center left columnspacing 0px end attributes row size 14px pOH size 14px equals cell size 14px minus sign size 14px log size 14px space begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets end style end cell row size 14px pOH size 14px equals cell size 14px minus sign size 14px log size 14px space size 14px 3 size 14px space size 14px cross times size 14px space size 14px 10 to the power of size 14px minus sign size 14px 3 size 14px comma size 14px 5 end exponent end cell row size 14px pOH size 14px equals cell size 14px 3 size 14px comma size 14px 5 size 14px minus sign size 14px log size 14px space size 14px 3 end cell row size 14px pH size 14px equals cell size 14px 14 size 14px minus sign begin mathsize 14px style left parenthesis 3 comma 5 minus sign log space 3 right parenthesis end style end cell row size 14px pH size 14px equals cell size 14px 10 size 14px comma size 14px 5 size 14px plus size 14px log size 14px space size 14px 3 end cell end table 

Jadi, jawaban yang benar adalah E.

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