a. (a) During this experiment you are asked to dissolve a small amoura of your p

Question

a. (a) During this experiment you are asked to dissolve a small amoura of your purified crystals in sthyt acetate to create a spotting 01 for TLc analysis what would the effeut be on the Rt value if vuu accidently usRd ethanol instead of ethyl acetate alaring this No effect on the RF vsloe Decrease the Kf value GRncrease the Re value The Re value would be zero Answer Trias 011 (b) Benzydrol will be recrystalized from hexane duting this experiment. 3lease identify :he following statements about recrystallization as true or false Select all that are True During a hot gravity fittration, you must use s flun ed Hter papo and a sterniesta funnel. everything in the sarnple diseawes in the hut woheart, it is still necessary carry out a hot gravity filtration to ensure a pure final crYstal. z boing aid is not reouired. you are short on iime, it is okay to place the hot recrystalization solution directly into an ice water bath At roon temperature, slowly add solvent until at of the sample dissolves. start heating the nask with just snough solvent in the fiask to cover the sample, when collect your crystals you can wash them with a small amount of the recrystallization solvent, but you should cool the solvent down in an ice bath before using it. you

Explanation / Answer

Ans 3. C) increase the Rf value.

Higher the eluting power , more the polar solvent is and more quickly the substance moves out of the chromatography column.

Ethanol has more eluting power than ethyl acetate, and hence it will increase the Rf value of the crystals.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.