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Berapa mL larutan dengan pH=12 yang harus dicampur dengan 100 mL larutan dengan pH=3 agar campuran pH menjadi 11?

Berapa mL larutan begin mathsize 14px style Na O H end style dengan pH=12 yang harus dicampur dengan 100 mL larutan begin mathsize 14px style H subscript 2 S O subscript 4 end styledengan pH=3 agar campuran pH menjadi 11?

Jawaban:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell open square brackets Na O H close square brackets colon end cell row blank blank blank row pH equals 12 row pOH equals cell 14 minus sign pH equals 2 end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell 10 to the power of negative sign 2 end exponent end cell row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell M cross times valensi end cell row M equals cell fraction numerator open square brackets O H to the power of minus sign close square brackets over denominator valensi end fraction equals 10 to the power of negative sign 2 end exponent over 1 equals 10 to the power of negative sign 2 end exponent end cell row blank blank blank row blank blank cell open square brackets H subscript 2 S O subscript 4 close square brackets end cell row blank blank blank row pH equals 3 row cell open square brackets H to the power of plus sign close square brackets end cell equals cell 10 to the power of negative sign 3 end exponent end cell row cell open square brackets H to the power of plus sign close square brackets end cell equals cell M cross times valensi end cell row M equals cell fraction numerator open square brackets H to the power of plus sign close square brackets over denominator valensi end fraction equals 10 to the power of negative sign 3 end exponent over 2 equals 5 cross times 10 to the power of negative sign 4 end exponent end cell row blank blank blank end table end style 

 

Nilai pH campuran yang diinginkan adalah 11 sehingga jumlah basa harus berlebih dan jumlah asam harus habis.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell mol space Na O H end cell equals cell V cross times M double bond V cross times 10 to the power of negative sign 2 end exponent space mmol end cell row cell mol space H subscript 2 S O subscript 4 end cell equals cell V cross times M equals 100 cross times 5 cross times 10 to the power of negative sign 4 end exponent equals 0 comma 05 space mmol space end cell end table end style 

  

 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row pH equals 11 row pOH equals cell 14 minus sign pH end cell row blank equals cell 14 minus sign 11 end cell row blank equals 3 row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell 10 to the power of negative sign 3 end exponent equals 0 comma 001 end cell row blank blank blank row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell M cross times Valensi end cell row blank equals cell fraction numerator mol over denominator V space campuran end fraction cross times valensi end cell row cell 0 comma 001 end cell equals cell fraction numerator 0 comma 01 V minus sign 0 comma 1 over denominator 100 plus V end fraction cross times 1 end cell row cell 0 comma 001 left parenthesis 100 plus V right parenthesis end cell equals cell 0 comma 01 V minus sign 0 comma 1 end cell row cell 0 comma 1 plus 0 comma 001 V end cell equals cell 0 comma 01 V minus sign 0 comma 1 end cell row cell 0 comma 2 end cell equals cell 0 comma 009 V end cell row v equals cell fraction numerator 0 comma 2 over denominator 0 comma 009 end fraction end cell row v equals cell 22 comma 22 space mL end cell end table end style 

 

Jadi, volume yang harus dicampurkan adalah 22,22 mL.

 

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