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mianfahad

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mianfahad Members

March 29, 201312 yr

March 29, 201312 yr

please tell me the reason.

H2SO4 is a strong base in aqueous solution.

but act as a base in HF Solution.

­­­­­H2SO4 + HF­­­ H3SO4+ + F-

weiming1998

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weiming1998 Senior Members

March 29, 201312 yr

March 29, 201312 yr

Although HF is a weak acid in aqueous solution, as it becomes more and more concentrated (approaching 100% hydrogen fluoride) , it becomes a lot more acidic, dissociating into H+ and HF2- ions instead, and doing so far more readily than when it is diluted in water. This could mean that it can donate a proton to the H2SO4, forming the H3SO4+ ion and the stable HF2- ion. Read this (http://en.wikipedia.org/wiki/Hydrofluoric_acid).

mianfahad

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March 29, 201312 yr

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March 29, 201312 yr

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Thanks a lot.

it is very useful for me

elementcollector1

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elementcollector1 Senior Members

March 30, 201312 yr

March 30, 201312 yr

H2SO4 is a strong acid in aqueous solution, not a base.

mianfahad

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mianfahad Members

March 30, 201312 yr

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March 30, 201312 yr

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H2SO4 is a strong acid in aqueous solution, not a base.

see again my question.

I asked H2SO4 acts as base in HF solution.

according to this equation

H2SO4 + HF­­­ H3SO4+ + F-

John Cuthber

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John Cuthber Resident Experts

March 30, 201312 yr

March 30, 201312 yr

see again my question.

I asked H2SO4 acts as base in HF solution.

according to this equation

H2SO4 + HF­­­ H3SO4+ + F-

Read what you wrote in the first post.

You said "H2SO4 is a strong base in aqueous solution."

Elementcollector1 was correcting this mistake.

 

I think the answer is that the reaction

H2SO4 + HF­­­ H3SO4+ + F-

does take place, but does not go to completion.

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5. H2SO4 show basicity in HF Solution

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