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Pertanyaan

Diketahui larutan 0,1 M NH 4 ​ CI dan K b ​ NH 4 ​ OH = 1 0 − 5 . Hitung harga K h ​ , [ H + ] , [ OH − ] , dan pH larutan!

Diketahui larutan 0,1 M  dan .

Hitung harga , dan pH larutan!   

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Jawaban terverifikasi

Jawaban

nilai , , ,pH berturut-turut adalah .

nilai begin mathsize 14px style K subscript h end stylebegin mathsize 14px style open square brackets H to the power of plus sign close square brackets end stylebegin mathsize 14px style open square brackets O H to the power of minus sign close square brackets end style, pH berturut-turut adalah begin mathsize 14px style 10 to the power of negative sign 9 end exponent comma space 10 to the power of negative sign 5 end exponent comma space 10 to the power of negative sign 9 end exponent comma space 5 end style.

Pembahasan

Pembahasan
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adalah suatu larutan garam yang terbentuk dari asam kuat HCl dan basa lemah NH 3 ​ . Garam yang terbentuk adalah garam yang bersifat asam. Penentuan tetapan hidrolisis ( ). Penentuan . Penentuan . Penentuan pH. Jadi, nilai , , ,pH berturut-turut adalah .

begin mathsize 14px style N H subscript 4 C I end style adalah suatu larutan garam yang terbentuk dari asam kuat  dan basa lemah . Garam begin mathsize 14px style N H subscript 4 C I end style yang terbentuk adalah garam yang bersifat asam.
 

  • Penentuan tetapan hidrolisis (begin mathsize 14px style K subscript h end style).

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell K subscript h end cell equals cell K subscript w over K subscript b end cell row cell K subscript h end cell equals cell 10 to the power of negative sign 14 end exponent over 10 to the power of negative sign 5 end exponent end cell row cell K subscript h end cell equals cell 10 to the power of negative sign 9 end exponent end cell end table end style 
 

  • Penentuan begin mathsize 14px style open square brackets H to the power of plus sign close square brackets end style.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell left square bracket H to the power of plus right square bracket end cell equals cell square root of K subscript h cross times M end root end cell row cell left square bracket H to the power of plus right square bracket end cell equals cell square root of K subscript h cross times open square brackets N H subscript 4 Cl close square brackets end root end cell row cell left square bracket H to the power of plus right square bracket end cell equals cell square root of 10 to the power of negative sign 9 end exponent cross times 10 to the power of negative sign 1 end exponent end root end cell row cell left square bracket H to the power of plus right square bracket end cell equals cell square root of 10 to the power of negative sign 10 end exponent end root end cell row cell left square bracket H to the power of plus right square bracket end cell equals cell 10 to the power of negative sign 5 end exponent end cell end table end style  
 

  • Penentuan begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets end style.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets O H to the power of minus sign close square brackets end cell equals cell fraction numerator K subscript w over denominator open square brackets H to the power of plus close square brackets end fraction 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 14 end exponent over 10 to the power of negative sign 5 end exponent 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 9 end exponent end cell end table end style   
 

  • Penentuan pH.

begin mathsize 14px style pH =- log space open square brackets H to the power of plus close square brackets pH equals minus sign log space 10 to the power of negative sign 5 end exponent pH equals 5 end style 
 


Jadi, nilai begin mathsize 14px style K subscript h end stylebegin mathsize 14px style open square brackets H to the power of plus sign close square brackets end stylebegin mathsize 14px style open square brackets O H to the power of minus sign close square brackets end style, pH berturut-turut adalah begin mathsize 14px style 10 to the power of negative sign 9 end exponent comma space 10 to the power of negative sign 5 end exponent comma space 10 to the power of negative sign 9 end exponent comma space 5 end style.

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