Phosphoric acid is a triprotic acid with the following pka values:
pka1=2.148, pka2=7.198, pka3=12.375
you wish to prepare 1.000 l of a 0.0500 m phosphate buffer at ph 7.540. to do this, you choose to mix the two salt forms involved in the second ionization, nah2po4 and na2hpo4, in a 1.000 l volumetric flask and add water to the mark. what mass of each salt will you add to the mixture?
mass nah2po4
mass na2hpo4
what other combination of phosphoric acid and/or its salts could be mixed to prepare this buffer? (check all that apply).
h3po4 and nah2po4
h3po4 and na2hpo4
h3po4 and na3hpo4
nah2po4 and na3po4
na2hpo4 and na3po4
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Ответ:
1
Explanation: