Define precaution for estimation of vitamin c in lemon juice, Biology

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Define precaution for estimation of vitamin c in lemon juice?

1. Rinse all glassware with 3% metaphosphoric acid before you begin your practical and subsequently each time you wash your flasks, cylinders, etc

2. Make up all volumes with 3% metaphosphoric acid.

3. Use a stainless steel knife for cutting the lemon.

4. After cutting the lemon, immediately squeeze the juice into 6% metaphosphoric acid.

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