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Diprotic Acids [Help please] - OCR A Chemistry

How do you work out the concentration of H+ ions of a diprotic acid.

For example (this is the question but made up numbers).

H2SO4 has a pH 2.50

Work out the concetation of H+ / [H+].

How do you do this since its diprotic?

I know the first step (I think) is to do 10 to the power -2.50.

Then what? Divide by 2???
Original post by Slenderman
How do you work out the concentration of H+ ions of a diprotic acid.

For example (this is the question but made up numbers).

H2SO4 has a pH 2.50

Work out the concetation of H+ / [H+].

How do you do this since its diprotic?

I know the first step (I think) is to do 10 to the power -2.50.

Then what? Divide by 2???


You don't actually have to assume that the acid is 100% dissociated to answer the question.

Remember that the pH = -log[H+]

and you are simply asked for [H+]
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Slenderman
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Yes but surely if it's diprotic, it requires it be divided by two???
Original post by Slenderman
Yes but surely if it's diprotic, it requires it be divided by two???


you are not asked for the concentration of sulphuric acid!!

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