Question

Pre-lab questions for Experiment #1: Crystallization 1. Why should open flames NOT be used around organic solvents? 2. Of the following, which are flammable? Circle all that apply. Acetone Water Ethanol 3. An organic compound (literature mp=255 - 256°C) has the following solubilities: solvent soluble cold soluble hot acetone yes yes water no no ethanol no yes petroleum ether no no Which is the best solvent to recrystallize the organic compound? Why? Why are the other solvents not suitable? Explain for each one. 4. Give the structures and names for the three possible unknown solids:

Answer 1

1) Many of the organic solvent are volatile in nature . volatile means au ste condition they vapourise readily. Now this volatile solvent catch the fire instantly and burn spontaneously. They are from mable in nature and hence, open Homes not be used around Organic 801 Vent's 2) Autone flammable Hater = not likely Ethanol frammable » Acetone and ethanol are volatile organic - flammable solventis 3) i) Recrystallisation is the process where the erude product will be purity and converteod into pure product. Here ethanol is best - solvent for recrystallisation. Because for the crystallization the suitable solvent is one in which the given substance is solubie in not condition and insoluble in cool condition. This combination is best por recrystalisation. i) Acelone : the given orgonic compound dissdiree in both cool and not condition so the organic compound can't be cetone is not suitable solvent I can't be separated hence klaturi petroleum ether: The given organic compound is any condition for both water and ether. Hence not suitable polvent insoluble at peroleum

stuctures and names of three unknown solids

1 ) Potassium nitrate (KNO3)

2 ) Sodium chloride (NaCl)

3 ) Calcium chloride (CaCl2)