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Question

The solubility product at 298Kis 6×10-31, what is the concentration of hydroxide ions in a saturated solution?


A

18×10-311/4

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B

18×10-311/2

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C

2.22×10-311/34

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D

4.86×10-291/4

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Solution

The correct option is A

18×10-311/4


Explanation for the correct options

(A)18×10-311/4

Step 1:

  • CrOH3(s)Cr3+(s)+3OH-(s)(s)(3s)

Step 2:

  • Expression used to calculate the value of sis given below:
  • Ksp=s.3s3
  • putting values in the above expression:
  • 6×10-31=27.s4s=627×10-311/4

Step 3:

  • OH-=3s=3×627×10-311/4=18×10-311/4M

Final Answer: Hence option (A) is correct., 18×10-311/4M.


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