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What are important characteristics to look for in good recrystallizing solvent? Why Is mixed solvent recrystallization used in the asplrin experiment? (5 points}Ind...

Question

What are important characteristics to look for in good recrystallizing solvent? Why Is mixed solvent recrystallization used in the asplrin experiment? (5 points}Indicate the appropriate waste container for the following: (8 points) Melting point capillary tubes Bromobenzene Toluene Ice bath Boiling chips CHzClz: Methanol: Acetic acid Diethyl ether (80.4:1)Dl wateran extraction experiment; the separatory funnel contalns immiscible Ilqulds: the aqueous phase (A) has density of 1.02 B/mLand the org

What are important characteristics to look for in good recrystallizing solvent? Why Is mixed solvent recrystallization used in the asplrin experiment? (5 points} Indicate the appropriate waste container for the following: (8 points) Melting point capillary tubes Bromobenzene Toluene Ice bath Boiling chips CHzClz: Methanol: Acetic acid Diethyl ether (80.4:1) Dl water an extraction experiment; the separatory funnel contalns immiscible Ilqulds: the aqueous phase (A) has density of 1.02 B/mLand the organic phase (B) has density of 0.83 elmL (8 points) Draw the set uP for extraction: Label all the components Make sure dramna two layers and Indlcate which the organic and which the aqueous:



Answers

Benzene and hexane are being considered as solvents to extract acetic acid from aqueous mixtures. At $30^{\circ} \mathrm{C},$ distribution coefficients for the two solvents are $\mathrm{K}_{\mathrm{B}}=0.098$ mass fraction acetic acid in benzene/mass fraction acetic acid in water and $\mathrm{K}_{\mathrm{H}}=0.017$ mass fraction acetic acid in hexane/mass fraction acetic acid in water.(a) Based on the distribution coefficients only, which of the two solvents would you use and why? Demonstrate the logic of your decision by comparing the quantities of the two solvents required to reduce the acetic acid content in $100 \mathrm{kg}$ of an aqueous solution from $30 \mathrm{wt} \%$ to $10 \mathrm{wt} \%$.(b) What other factors may be important in choosing between benzene and cyclohexane?

Factors that affect the Saal ability of a solid into a liquid include polarity i n di poll interaction dispersed and dispersion forces. Miss Herbal is when two liquids air completely Sobel on each other.

So we have two molecules up on the screen. We have die missile ether and we have ethanol. Now these are two constitutional Isom is where they have the same molecular formula. However, they have a different connectivity off atoms as well as different physical properties. So it's a firstly look at which one has the higher boiling point that is, in fact our diamonds out ether that is drawn up on the left and now to consider which one is soluble in water that is our ethanol group, which is drawn up on the right.

For a switch. Solvent is best for non polar solve use. Recall that the idea that like dissolves like so if I have a non non polar Salyut, then what's gonna dissolve it best is going to be a put the non polar solvent. So we're trying to find which of these is non polar. Now, remember that whenever you see, we know that water is polar. Anytime you see these ohh groups Okay, those were definitely pulled That those those ad pol Eri to a molecule. So these oh age groups this, um see, that will bond into an oath carbon Delavan introduction. But this is also a polar group. So all of these solvents are polar tall. You in is the only one that doesn't have any of these It all. All it has is carbon, carbon or carbon hydrogen months. So this is a non polar solvent. So it would be best for dissolving non polar Saul use The correct answer here is tall Ewing. It's the only one that doesn't have any pull herbs

The answer to both part both parts of this question is found in ethanol having an O. H. Group where dimethyl ether does not because ethanol has an O. H. Group, then it can exhibit hydrogen bonding, hydrogen bonding is a very strong inter molecular force holding the molecules more tightly to each other, causing the boiling point to be much higher, meaning more energy must be added in order to separate the molecules from the liquid phase into the gaseous phase. This is why Ethanol has a boiling point of 78, And Dimethyl Ether would have the boiling point of -24°C.. For part B says one compound is soluble in water, the other one is hardly soluble at all. Well water has O. H. Groups, so it exhibits the same type of inter molecular forces as ethanol. Therefore, a mixture of water molecules and ethanol molecules share similar inter molecular forces were a mixture of water and dimethyl ether do not. Therefore, the water molecules with a stronger inter molecular forces will push the dimethyl ether molecules out of the way so that they can be attracted to each other well. And then the dimethyl ether molecules, by default, will be pushed out of the water, causing them to be less soluble than ethanol molecules.


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