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Larutan 10 mL N H 3 ​ 0,8 M dicampur dengan 100 mL HCl 0,8 M, menurut reaksi: N H 3 ​ ( a q ) + H Cl ( a q ) → N H 4 ​ Cl ( a q ) ( K w = 1 0 − 14 , K b N H 3 ​ = 1 0 − 5 ) Harga pH larutan tersebut adalah....

Larutan 10 mL  0,8 M dicampur dengan 100 mL HCl 0,8 M, menurut reaksi:

Harga pH larutan tersebut adalah....

  1. 5 - log 2

  2. 5 + log 2

  3. 9 - log 2

  4. 9 + log 2

  5. 12 + log 2

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S. Lubis

Master Teacher

Mahasiswa/Alumni Universitas Sumatera Utara

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Pembahasan

begin mathsize 12px style N H subscript 3 space open parentheses a q close parentheses plus H C l space open parentheses a q close parentheses rightwards arrow N H subscript 4 C l space open parentheses a q close parentheses  0 comma 8 space M space space space space space space space space space space space space space space space space space space space space space space space space space space space space space 0 comma 8 space M  100 space m L space space space space space space space space space space space space space space space space space space space space space space space space space space 100 space m L    D i tan y a colon space h a r g a space p H space l a r u tan space y a n g space t e r j a d i ?    N H subscript 3 space open parentheses a q close parentheses space space space space space space space space space space plus space space H C l space open parentheses a q close parentheses space space space space space space space space space space space rightwards arrow space N H subscript 4 C l space open parentheses a q close parentheses  0 comma 8 space M cross times 100 space m L space space space space space 0 comma 8 space M cross times 100 space m L  M equals 80 space m m o l space space space space space space space space space 80 space m m o l space space space space space space space space space space space space space space space space space space minus  bottom enclose R equals 80 space m m o l space space space space space space space space space 80 space m m o l space space space space space space space space space space space space space space space space space space 80 space m m o l end enclose space space  S equals negative space space space space space space space space space space space space space space space space space space space space minus space space space space space space space space space space space space space space space space space space space space space space space space space space space space 80 space m m o l    M o l a r i t a s space g a r a m  equals fraction numerator m m o l space g a r a m over denominator v o l u m e space t o t a l end fraction  equals fraction numerator 80 space m m o l over denominator 200 space m L end fraction equals 0 comma 4 space M    K a r e n a space s e m u a space r e a k tan space h a b i s comma space b e r a r t i space m e r u p a k a n space c a m p u r a n space h i d r o l i s i s. space  H i d r o l i s i s space d i l i h a t space d a r i space s i f a t space y a n g space k u a t comma space d i sin i space y a n g space k u a t space a d a l a h space H C l space left parenthesis a s a m right parenthesis.    R u m u s space H i d r o l i s i s space u n t u k space G a r a m space a s a m colon  open square brackets H to the power of plus close square brackets equals square root of fraction numerator K w cross times m o l a r i t a s space g a r a m cross times v a l e n s i over denominator K b end fraction end root  open square brackets H to the power of plus close square brackets equals square root of fraction numerator 10 to the power of negative 14 end exponent cross times 0 comma 4 space M cross times 1 over denominator 10 to the power of negative 5 end exponent end fraction end root  open square brackets H to the power of plus close square brackets equals square root of 4 cross times 10 to the power of negative 10 end exponent end root  open square brackets H to the power of plus close square brackets equals 2 cross times 10 to the power of negative 5 end exponent    p H equals negative log open square brackets H to the power of plus close square brackets  p H equals negative log open square brackets 2 cross times 10 to the power of negative 5 end exponent close square brackets  p H equals 5 minus log space 2 end style

 

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