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100 mL NaOH 0,008 M direaksikan dengan 100 mL C H 3 ​ COO H 0,008 M ke dalam larutan garam yang terbentuk ditetesi larutan encer C a C l 2 ​ dan penetesan diakhiri ketika di larutan tepat jenuh tepat akan mengendap C a ( O H ) 2 ​ . Jika Kw = 1 0 − 14 Ksp = 4 x 1 0 − 16 , Ka = 1 0 − 5 , maka [ C a 2 + ] saat tepat jenuh adalah....

100 mL NaOH 0,008 M direaksikan dengan 100 mL  0,008 M ke dalam larutan garam yang terbentuk ditetesi larutan encer  dan penetesan diakhiri ketika di larutan tepat jenuh tepat akan mengendap . Jika Kw =  Ksp undefined = 4 x , Ka = , maka [] saat tepat jenuh adalah....

  1. undefined M

  2. 10 to the power of negative 3 end exponentM

  3. 10 to the power of negative 4 end exponent M

  4. undefinedM

  5. undefined M

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M. Robo

Master Teacher

Jawaban terverifikasi

Pembahasan

Mol NaOH = M x V Mol NaOH = 0,008 M x 100 mL Mol NaOH = 0,8 mmol Mol = M x V Mol = 0,008 M x 100 mL Mol = 0,08 mmol Kedua pereaksi habis, yang tersisa adalah garam Garam yang terbentuk ditetesi Pada saat tepat jenuh Qsp = Ksp, maka Ksp =

Mol NaOH = M x V

Mol NaOH = 0,008 M x 100 mL

Mol NaOH = 0,8 mmol

 

Mol C H subscript 3 C O O H =  M x V

Mol C H subscript 3 C O O H = 0,008 M x 100 mL

Mol C H subscript 3 C O O H = 0,08 mmol

 

Kedua pereaksi habis, yang tersisa adalah garam

open square brackets C H subscript 3 C O O N a close square brackets space equals space fraction numerator m o l over denominator v space t o t a l end fraction  open square brackets C H subscript 3 C O O N a close square brackets space equals fraction numerator 0 comma 08 space m m o l over denominator 200 space m L end fraction  open square brackets C H subscript 3 C O O N a close square brackets space equals space 4 space cross times space 10 to the power of negative 3 end exponent

 

open square brackets O H to the power of minus close square brackets equals square root of fraction numerator K w over denominator K a end fraction cross times open square brackets G close square brackets end root equals square root of 10 to the power of negative 14 end exponent over 10 to the power of negative 5 end exponent cross times 4 space cross times space 10 to the power of negative 3 end exponent end root equals square root of 4 cross times 10 to the power of negative 12 end exponent end root equals 2 cross times 10 to the power of negative 6 end exponent

Garam yang terbentuk ditetesi C a C l subscript 2

Pada saat tepat jenuh Qsp = Ksp, maka open square brackets C a to the power of 2 plus end exponent close square brackets

C a open parentheses O H close parentheses subscript 2 rightwards arrow C a to the power of 2 plus end exponent plus 2 O H to the power of minus

Ksp = open square brackets C a to the power of 2 plus end exponent close square brackets open square brackets O H to the power of minus close square brackets squared

open square brackets C a to the power of 2 plus end exponent close square brackets equals fraction numerator K s p over denominator open square brackets O H to the power of minus close square brackets squared end fraction equals fraction numerator 4 cross times 10 to the power of negative 16 end exponent over denominator open parentheses 2 cross times 10 to the power of negative 6 end exponent close parentheses squared end fraction equals 10 to the power of negative 4 end exponent space M

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