oxalic acid

[protheroe]

I bought 99.6%oxalic.how much shall I add to a kilo of sugar and a litre of water.
I am asking because I normally add 75grams but I think the purity of the last batch I had was a lot lower

 

[jenkinsbrynmair]

I'd add 75 grams - that's how much 99% pure stuff I usually add