Jika nilai Kw​ pada 100 ∘C dianggap 10−12, berapa konsentrasi ion H+ dan OH− dalam air murni pada suhu tersebut?

Pertanyaan

Jika nilai begin mathsize 14px style K subscript w end style pada begin mathsize 14px style 100 space degree C end style dianggap begin mathsize 14px style 10 to the power of negative 12 end exponent end style, berapa konsentrasi ion begin mathsize 14px style H to the power of plus sign end style dan begin mathsize 14px style O H to the power of minus sign end style dalam air murni pada suhu tersebut?
 

Y. Rochmawatie

Master Teacher

Jawaban terverifikasi

Jawaban

Konsentrasi ion begin mathsize 14px style begin bold style open square brackets H to the power of plus sign close square brackets end style end style dan ion begin mathsize 14px style begin bold style open square brackets O H to the power of minus sign close square brackets end style end style adalah begin mathsize 14px style bold 10 to the power of bold minus sign bold 6 end exponent bold space italic M end style

Pembahasan

Pembahasan

air murni bersifat netral (pH=7), sehingga:

begin mathsize 14px style open square brackets H to the power of plus sign close square brackets equals open square brackets O H to the power of minus sign close square brackets equals x end style

nilai begin mathsize 14px style K subscript w end style didapatkan dari perkalian nilai begin mathsize 14px style open square brackets H to the power of plus sign close square brackets end style dengan begin mathsize 14px style open square brackets O H to the power of minus sign close square brackets end style, atau dapat ditulis:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell K subscript w end cell equals cell open square brackets H to the power of plus sign close square brackets open square brackets O H to the power of minus sign close square brackets end cell row cell K subscript w end cell equals cell x middle dot x end cell row cell 10 to the power of negative sign 12 end exponent end cell equals cell x squared end cell row x equals cell 10 to the power of negative sign 6 end exponent end cell end table end style

Jadi, Konsentrasi ion begin mathsize 14px style begin bold style open square brackets H to the power of plus sign close square brackets end style end style dan ion begin mathsize 14px style begin bold style open square brackets O H to the power of minus sign close square brackets end style end style adalah begin mathsize 14px style bold 10 to the power of bold minus sign bold 6 end exponent bold space italic M end style

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Pertanyaan serupa

Pada persamaan reaksi: H+(aq)+OH−(aq)⇌H2​O(l)  △H= −x kJ.mol−1 Kw​ pada 25 ∘C adalah 1,0×10−14. Berdasarkan data reaksi yang diberikan, maka ...

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