8. If you added the following to water what would happen to the pH of the soluti

Question

8. If you added the following to water what would happen to the pH of the solution. Would become acidic, basic, or stay neutral) (6 points) a. ethanol b. phenol 9. If a compound gave a yellow precipitate with 2,4-dinitropenyl hydrazine but did not react with Tollens reagent or turn chromic acid green would the compound be (a) a tertiary alcohol (b) aldehyde (c) ketone 10. Give two test that you could use to determine if a compound is an aldehyde or a ketone. 6 points) 11. Dichloromethane's density is 1.37 g/mL. Would it be the upper of lower layer in extraction of a water solution? (6 points) 12. Calculate your theoretical yield of aspirin from 10 grams of salicylic acid using the following equation: (8 points) -X 180 g aspirin =-g aspirin 10 g salicylic acid X 1 mole 138 g salicylic acid1 mole 13. If your 10 grams of salicylic acid produced 11.1 grams of product, what would be the percent yield of your reaction? (8 points)

Explanation / Answer

ans 8

Ethanol's hydroxyl group causes the molecule to be slightly basic

phenol in water is acidic.

ans 9 compound is a ketone

Aldehydes and ketones both react with 2,4-dinitrophenylhydrazine as a test for the carbon-oxygen double bond to give yellow precipitate.

Tollens' test, is used to distinguish between an aldehyde and a ketone.An aldehydes is readily oxidized, whereas ketones are not .

ans 10

Fehling's Test

Equal volumes of Fehling's A and Fehling's B are mixed and the sample is added. The resulting solution is heated.

Aldehyde - The aldehyde is oxidised and a brick red Cu(I) oxide precipitates out,

Ketone - No reaction occurs.

Tollen's Test

This test contains the complex [Ag(NH3)2]+. It is made by mixing ammonia with silver nitrate.

Aldehyde - Upon heating with Tollen's reagent solid silver metal is produced as Ag+ is reduced to Ag.

Ketone - No reaction occurs.

ans 11

as dichloromethane is denser than water it will form lower layer and water will form upper layer

ans 12

13.04 g

ans 13

percent yield = (actual yield/theoretical yield) x 100%

= (11.1/13.04)*100

= 85.12%

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