Question about calculating concentration ?

Question

I'm trying to calculate the concentration of citric acid in orange juice that has been diluted 1:9 (juice to water). 20ml of this is used to react with NaOH in acid base titration process. I was wondering, when calculating the concentration using c=n/v, do I use 0.02 L for V or 0.002L for V because of the dilution? (for the juice)

Hope my question isn't too hard to understand. Any help is appreciated. Thanks

Answer 1

Once you find the concentration of the citric acid in the diluted 20 mL sample, you'll need to multiply that answer by 10 because it was ten times more concentrated before diluting.