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        Q: Why would you add sulfuric acid to a mixture of oxalic acid and sodium oxalate?
A: When you add sodium hydroxide to hydrochloric acid it reacts to form a neutral salt ( NaCl ) in solution , once sufficient acid is in addition to neutralise all of the basis . 

Q: Can tomato contain oxalic acid?
A: Yes . Tomatoes contain little sums of citric acid . In connection to citric intolerance you are able be able 's using some organic based tinned products as they do not contains additives that were likely increase the tiers or citric acid included in the product . 

Q: Which indicator is used in titration of oxalic acid with HCl?
A: Phosphoric acid utilized , since it tend to reduce any interferingcolour modifications . Also because of the presence of phosphoric acid ( thephosphate complex of Fe 3+ is colorless , so the yellowcolouration of Fe 3+ ions does not disrupt the end point detection .