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help on buffer question

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blazingwes:
i need help on one of my questions on my hw assignment.. i don't know how to do it.

how you one make a one liter solution with a pH os 5.00, so that it will be buffered?  (Use a 0.100 M acid solution)

wath is the pH of the solution if acid is added so that the Hydrogen ion concentration is .100M

Borek:
What acid? Do you know what Henderson-Hasselbalch equation is?

blazingwes:
soo will this be the correct answer?
adding .100 M of nitrous acid to 4.47 M of nitrite to get a buffer of ph 5.00..

but.. i don't understand the 2nd question

Borek:
For pH 5.0 acetic acid will be much beter. Nitrous acid has pKa = 3.37, with pH 5.0 you are too far from the pKa for buffer to be effective, see plot at buffer capacity lecture.

Looks like the second question has nothing to do with buffers :)

blazingwes:
one more question wat is a singel-step equation????


how you write BaSO3 +H+ = Ba2+ + H2SO4

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