How to make oxalic acid?

Question

for project titration

If i have oxalic acid pellets, or tablets
how would i make it?
and..what concentration is good
to use it to standardize sodium hydroxide?
and..what concentration of sodium hydorxide be? recommendation?
My lab is "Determine the concentation of acid in beverages"

Answer 1

From Wikipedia:
"Although it can be readily purchased, oxalic acid can be prepared in the laboratory by oxidizing sucrose using nitric acid in the presence of a small amount of vanadium pentoxide as a catalyst.[1]
^ Practical Organic Chemistry by Julius B. Cohen, 1930 ed. preparation #42"

The vanadium pentoxide might be a little difficult to come by.