Name: Separation-1 Assignment Score:/maximum 35 Q1 (5 points): An organic chemis

Question

Name: Separation-1 Assignment Score:/maximum 35 Q1 (5 points): An organic chemist is planning to extract 1.00 9 coefficient for this o diethy in 180 mL of water into a diethyl ether solvent. The distribusoutio 3ties whtant? (report to 2 favoring the ether solvent. If the chemist washes the aqueous io the aqueous sove ether, what percent of the original organic compound decimal places) ne to extract 1.00 grams of an organic compound dissolved rsoveThe distribution coefficient for this system is 12.0 washes the aqueous solution 3 times with 40.0 mL of diethyl c compound remains in the aqueous solvent? (report to 2 Q2(5 points): HA, from 40.0 mL of aqueous solution HA, from 40.0 ml of aqueous solution. What is the distribution coefficient, D, for HA at a pH -3.00? The K, for HA is 3.5 x 10. (report to 2 decimal places) A single extraction with 110.0 mL of extracts or removes 90.0% of the weak acid, Q3(5 points): A single extraction with 100 mL of CHCl, extracts or removes (Ka = 3.5 x 10, pKa 4.46), from 50 mL of aqueous solution at a pH-2.50. A single extraction with 100 mL of CHC, extracts or removes 88.5% of the weak acid, HA If a student carries out the he aqueous phase is 0.01, is this nts): result is reasonable? a) This result is reasonable. HA is the principal species in solution, which is less soluble in the aque ous se. Therefore, 11.5% should remain in ithe principal species in solution, which is less soluble in the c) This result is not reasonable. HA is the principal species in aqueous phase. Therefore.>11.5% should remainin aqueousphas substance from water into ether, which is more effective? Q4(5 points): If you are extracting a substance from wateri (a) Use one extraction with 300 mL of ether (b) Use three extractions with 100 mL. (c) Both are equally effective. yeous acet acid into hexane, which is less effective:? Q5(S points): If you wish to extract aqueous acete (a) adjust the aqueous phase to pH 3 (b) adjust the aqueous phase to pH 8 (c) both are equally effective

Explanation / Answer

Q4. An extraction is always more effective when you do multiple extractions. This is because, the more extractions you do with some volume, the more % of extracted compound you'll have, the distribution coefficient will rise. Therefore, If a substance when it's extracted with 300 mL at once, it will extracted the component but at a lower range that if you do with three succesful extractions, where the % of extraction will rise. So correct option would be (b).

Q5. You want to extract an acid, so, the pH must be acid too. In this case, pH = 8 means that we are not in in the acid range and will be in solution the acetate ion. So correct option would be a) adjust to pH = 3.

Q6. If K = [S]2 / [S]1   solving for S2:

[S]2 = k[S]1 = 3*0.15 = 0.045 M

let's calculate moles for each of them:

[S]1 = 0.015 * 0.060 = 0.0009 moles

[S]2 = 0.045 * 0.015 = 0.000675 moles

quotient = 0.000675 / 0.0009 = 0.75

The rest of your questions post then in another question thread.

Hope this helps

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