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Sebanyak 100 mL KOH 0,04 M dicampur dengan 100 mL HCOOH 0,04 M menurut reaksi: K O H ( a q ) ​ + H COO H ( a q ) ​ → H COO K ( a q ) ​ + H 2 ​ O ( l ) ​ Jika K a H COO H = 2.1 0 − 4 d an K w = 1 0 − 14 , pH campuran tersebut sebesar...

Sebanyak 100 mL KOH 0,04 M dicampur dengan 100 mL HCOOH 0,04 M menurut reaksi:

Jika , pH campuran  tersebut sebesar...

  1. 8 space plus space log space square root of 2

  2. 8 space plus space log space 1

  3. 6 minus space log space 1

  4. 6 minus space log space square root of 2

  5. 2 space minus space space log space 6

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S. Utari

Master Teacher

Mahasiswa/Alumni Universitas Negeri Medan

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Pembahasan

Mol KOH = M x V = 0,04 M x 100 mL = 4 mmol Mol HCOOH = M x V = 0,04 M x 100 mL = 4 mmol KOH + HCOOH HCOOK + H 2 O Mula 4 mmol 4 mmol Reaksi 4 mmol 4 mmol 4 mmol 4 mmol Sisa 4 mmol 4 mmol

Mol KOH = M x V = 0,04 M x 100 mL = 4 mmol

Mol HCOOH = M x V = 0,04 M x 100 mL = 4 mmol

 

KOH       +    HCOOH      

rightwards arrow

HCOOK       +          H2O

Mula

4 mmol                   4 mmol

 

 

Reaksi

4 mmol                   4 mmol

 

4 mmol                     4 mmol

Sisa

  1.  

 

4 mmol                     4 mmol  

 open square brackets H C O O K close square brackets equals fraction numerator m o l over denominator V space t o t a l end fraction equals fraction numerator 4 space m m o l over denominator 200 space m L end fraction equals 0 comma 02 space M  H C O O K space m e r u p a k a n space g a r a m space b a s a comma space s e h i n g g a colon  open square brackets O H to the power of minus close square brackets equals square root of fraction numerator K w cross times open square brackets g a r a m close square brackets over denominator K a end fraction end root equals square root of fraction numerator 10 to the power of negative 14 end exponent cross times open square brackets 0 comma 02 close square brackets over denominator 2 cross times 10 to the power of negative 4 end exponent end fraction end root equals square root of 10 to the power of negative 12 end exponent end root equals 10 to the power of negative 6 end exponent M  p O H equals space minus space log space 10 to the power of negative 6 end exponent equals 6  p H equals space 14 minus p O H equals 14 minus 6  space space space space space space equals space 8 space a t a u space 8 space plus space log 1

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