Please could I have some help, I'm really stuck!
You are given the following reagents:
H3PO4, NaH2PO4, Na2HPO4, Na3PO4
Describe the relative quantities of each that you would use to prepare a buffer solution with a pH = 7.5 and show all your working. Note that you have to decide how many of them to use.
H3PO4, NaH2PO4, Na2HPO4, Na3PO4
Describe the relative quantities of each that you would use to prepare a buffer solution with a pH = 7.5 and show all your working. Note that you have to decide how many of them to use.
Original post by ew904
You are given the following reagents:
H3PO4, NaH2PO4, Na2HPO4, Na3PO4
Describe the relative quantities of each that you would use to prepare a buffer solution with a pH = 7.5 and show all your working. Note that you have to decide how many of them to use.
H3PO4, NaH2PO4, Na2HPO4, Na3PO4
Describe the relative quantities of each that you would use to prepare a buffer solution with a pH = 7.5 and show all your working. Note that you have to decide how many of them to use.
you need the ka values of the dissociations ...
Once you have the Ka values choose one of the dissociations
eg H3PO4 <--> H2PO3
Convert pH to [H+] Do you know how to do that?
Rearrange [H+] = Ka x [acid]/[base]
to find [acid]/[base] this is the ratio you need.
eg H3PO4 <--> H2PO3
Convert pH to [H+] Do you know how to do that?
Rearrange [H+] = Ka x [acid]/[base]
to find [acid]/[base] this is the ratio you need.
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