Chem 103 Lab Final

What were the physical properties used to identify alkanes and alkenes?

Boiling points and Density

What color is the potassium permanganate reagent in the Baeyer's test?

Purple

What color is the bromine in the bromine test?

Yellowish/ Orange

Which hydrocarbon will have positive result for the baeyer's and/or bromine test?

Alkenes

What solvent was used to extract curcumin?

Isopropyl alcohol

What is the percent of curcumin found in turmeric?

3-5%

What can curcumin be used as in the lab?

pH Indicator

What instruments were used in this lab? Also know the parts.

Spec 20

What is the maximum wavelength of curcumin in the UV/Vis sprectrum?

425

What test was used to classify aldehydes and ketones?

Tollens

Will a ketone or aldehyde react with the Tollen's reagent?

Aldehyde will react but Ketone will not.

What does a positive Tollen's test look like?

Silver

What physical state are the unknown ketone/aldehyde in?

Liquid

What is the ketone/aldehyde derivative called?

2,4 dinitrophenylhydrazone

What reagent was used to make the derivative?

2,4, dinitrophenylhydrazine

What is the physical state of the derivative and color is it?

Solid and Yellow

What compound was extracted out of the aspirin tablet? What solvent was used to extract it?

acetylsalicyclic acid

What was the acid used in the hydrolysis of acetylsalicyclic acid to salicyclic acid?

HCl which is diluted 20% to Muratic acid

What temperature did this reaction performed at? (salicyclic acid) What is the byproduct of this reaction?

60 degree Celsius and acetic acid

What acid catalyst was used in the esterification reaction (SA to ES)?

Boric acid

What alcohol was used in the esterification of SA to produce the ester?

ethanol

What is the ester produced in this lab (Salicyclic acid)? What is the odor of this ester?

ethyl salicyclate and wintergreen

What is the reagent used to form a violet complex with salicyclic acid but not with acetylsalicyclic acid?

ferric ammonium sulfate

What is the formula for Rf values?

Rf= (distance moved by the amino acid)/ (distance moved by solvent front)

What was sprayed on the chromatograms to help identify the amino acids?

ninhydrin

What is the first test used to determine the unknowns in the flow chart?

solubility of water

What was the second test for solubility and what was positive for that test?

pH indicator and different pH ranges

What was used to measure the pH?

Universal pH indicator

What color is malachite?

bluish green

What salt was used to make malachite?

Na2CO3 sodium carbonate

What is malachite considered as in the paint? What is the egg considered as in paint?

Pigment and egg is the medium or suspension