Chemistry, 20.06.2020 14:57, yasyyas646646
1. In re-crystallization method, if a compound was crystallized during the hot filtration step, what is the best way to overcome this problem?
2. In coupling reaction for the preparation of Methyl orange indicator, NaCl was added in re-crystallization step, give reason and discuss.
3. How poly phenols (tannins) can be removed from a solution containing Caffiene?
4. Which method is more efficient for the extraction of natural products? Reflux or Soxhlet? Why?
5. How a mixture of salicylic acid and 3-methylxanthine can be separated?
Answers: 2
Chemistry, 22.06.2019 23:00, lufung8627
Consider the reaction: 2al(s) + fe2o3(s) → al2o3(s) + 2fe(s) the δhf for fe2o3(s) = -824.3 kj/mole. the δhf for al2o3(s) = -1675.7 kj/mole. finish the equation. δhrxn = [(1)( kj/mole) + (2)( kj/mole)] - [(1)( kj/mole) + (2) ( kj/mole)]
Answers: 1
Chemistry, 23.06.2019 03:40, ElegantEmerald
The following questions a24 - a26 relate to 100 ml of 0.0150 m solution of benzoic acid (c6h3cooh). ka(c6h3cooh) = 6.4 x 10^-5. what is the ph of the solution after the addition of 1 x 10^-3 moles of naoh? you may assume no volume change to the solution upon addition of the naoh.
Answers: 2
Chemistry, 23.06.2019 05:50, cicimarie2018
Which of the following is not a characteristic of s waves?
Answers: 1
1. In re-crystallization method, if a compound was crystallized during the hot filtration step, what...
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