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Devonā€™s laboratory is out of material to make phosphate buffer. He is considering using sulfate to make a buffer instead. The pka values for the two hydrogens in H2SO4 are -10 and 2.
Will this approach work for making a buffer effective near a pH of 7?
O yes
O not enough information to answer
O no
What is the optimal pH for sulfateā€‘based buffers? Enter your answer as a whole number.

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Answer:

Is not possible to make a buffer near of 7.

Optimal pH for sulfateā€‘based buffers is 2.

Explanation:

The dissociations of Hā‚‚SOā‚„ are:

Hā‚‚SOā‚„ ā‡„ Hāŗ + HSOā‚„ā» pkaā‚ = -10

HSOā‚„ā» ā‡„ Hāŗ + SOā‚„Ā²ā» pkaā‚‚ = 2.

The buffering capacity is pkaĀ±1. That means that for Hā‚‚SOā‚„ the buffering capacity is in pH's between -11 and -9 and between 1 and 3, having in mind that pH's<0 are not useful. For that reason, is not possible to make a buffer near of 7.

The optimal pH for sulfateā€‘based buffers is when pka=pH, that means that optimal pH is 2.

I hope it helps!

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