Chemistry

Chemistry, 07.08.2019 01:20, ijustneedhelploll

1. calculate the amounts of salicylic acid, 1-naphthol, 2-naphthol, 8-anilino-1-naphthalensulfonic acid ammonium salt, or n, n-dimethylaniline needed for part 1b of this experiment.

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Chemistry, 22.06.2019 05:40, Maryjasmine8001

Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml

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Chemistry, 22.06.2019 08:00, katelyn0579

Straightforward questions answered in the powerpoint slidesreaction: heating the starting materials under refluxwhat does it mean to heat under reflux? why do we choose water as the reflux solvent? what are boiling chips used for? why do we put a condenser on top of the reaction? why do we add heat and let the reaction stir for 30 minutes? why do we add sulfuric acid to the reaction after it cools as opposed to when it’s still hot? separation: filtration of precipitatewhy don’t we do an aqueous and organic extraction in the separatory funnel? why do you rinse the salicylic acid on the filter with ice cold water? purification: recrystallization of salicylic acid (no hot filtration needed)what is the difference in the amount of room temperature water vs. boiling water needed to dissolve the salicylic acid (assume a 1.2 gram yield of salicylic acid)? remember, in the lab if you need x ml of boiling water to dissolve a solid, then you should add a little more (definitely no more than 1.5 times the theoretical amount) to ensure it doesn’t recrystallize prematurely.analysis: melting point of salicylic acidwhat can you conclude if the melting point of the salicylic acid you just synthesized is 152-155oc and the 1: 1 mix of your product and “synthetic” salicylic acid is 151-154oc?

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Chemistry, 26.06.2019 17:10, natasniebow

Salicylic acid, hoc6h4co2h, and its derivatives have been used as pain relievers for a long time. salicylic acid occurs in small amounts in the leaves, bark, and roots of some vegetation (most notably historically in the bark of the willow tree). extracts of these plants have been used as medications for centuries. the acid was first isolated in the laboratory in 1838. (a) both functional groups of salicylic acid ionize in water, with ka = 1.0 × 10-3 for the —co2h group and 4.2 × 10-13 for the —oh group. what is the ph of a saturated solution of the acid (solubility=1.8 g/l)? (b) aspirin was discovered as a result of efforts to produce a derivative of salicylic acid that would not be irritating to the stomach lining. aspirin is acetylsalicylic acid, ch3co2c6h4co2h. the —co2h functional group is still present, but its acidity is reduced, ka = 3.0 × 10-4. what is the ph of a solution of aspirin with the same concentration as a saturated solution of salicylic acid (see part a). (c) under some conditions, aspirin reacts with water and forms a solution of salicylic acid and acetic acid: ch3co2c6h4co2h(aq) + h2o(l) → hoc6h4co2h(aq) + ch3co2h(aq) which of the acids, salicylic acid or acetic acid, produces more hydronium ions in such a solution?

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Chemistry, 06.07.2019 13:40, kaitherusher

How could you separate lauric acid from alpha naphthol?

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