You take guava extract (properly measured) and titrate it with any base for eg sodium hydroxide (naoh) using a burette. u obtain the amount of naoh used in neutralizing that fixed amount of guava extract. use the common mole and molarity concept. once u find our the molarity of the guava extract, multiply with the molar mass of oxalic acid...u will get the strength.
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B.Tech, IIT Delhi