0.280 g of impure acetylsalicylic acid is recrystallized from a suitable solvent. The mass of the recrystallized product is 0.139 g and the melting point is 121.6–122.9 °C. Calculate the percent recovery of the acetylsalicylic acid to 1 decimal place.
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0.280 g of impure acetylsalicylic acid is recrystallized from a suitable solvent. The mass of the recrystallized product is 0.139 g and the melting point is 121.6–122.9 °C. Calculate the percent recovery of the acetylsalicylic acid to 1 decimal place.
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- Table 1. Solubility Tests. Functional Group Observations (specify type if any) Sample in concentrated (+/-) H2SO4 Color orange Hydroxyl group Hydroxyl group Hydroxyl group 1-butanol Color orange 2-butanol Color orange diisopropyl ether Look at the structures of compounds tested for solubility in concentrated H2SO4. What generalization can be made for a substance to be soluble in concentrated H2SO4 ?b) Will the sample be contaminated with any of the impurities? Calculate the percent purity of the initial sample (in terms of compound A) - ( i.e. express the amount of compound A in the initial sample as a percentage of the mass of initial sample). Calculate the percent purity of the final sample (in terms of compound A) - (i.e. express the amount of compound A in the final sample as a percentage of the mass of final sample). Did the recrystallization procedure result in an increase of the percent purity of compound A in the sample? Comment on the results.Calculate the vapor pressure (in mmHg) above of solution containing 50.0 g of ethylbromide (CH3CH2Br) and 29.484 g of 1,2-ethanediamine (NH2CH2CH2NH2) at 21.0oC. The vapor pressure of ethyl bromide at 21.0oC is 400 mmHg. The vapor pressure of 1,2-ethanediamine at 21.0oC is 10.0 mmHg. Your answer should have 3 significant figures.
- 2. An impure sample of compound D is contaminated with a number of impurities. The sample is to be purified by recrystallization. The solubility properties of three potential solvents are summarized below. Choose the best solvent and explain your answer. Include comments on each of the three solvents. Solubility of D at the boiling point Solubility of D at - 0°C of the solvent Solvent X 0.08g/mL 0.06 g/mL Solvent Y 0.67 g/mL 0.59 g/mL Solvent Z 0.63 g/mL 0.12 g/mLLook up the structures and melting points for acetanilide and salicylic acid.Predict whether the rate of cooling during a recrystallization process will have any effect on thepurity of the crystals formed.1. A pure compound has a melting point of 102-103°C. Predictthe general effect on the melting point whena small amount of an impurity with a melting point of 212-214°C is added to the compound.
- A mixture of ethanol, benzaldehyde and KMnO4 is mixed together. Would you expect a precipitate to form based on the reactants functional groups?You need to purify 0.8 grams of an impure sample of trans-cinnamic acid. After the purification is completed you isolate 0.57 grams of trans-cinnamic acid and record a melting point range of 129-132 °C. Cinnamic Acid has a solubility in ethanol of 13.9 g/100 ml at 10 °C and a solubility in water of 0.055 g/100 ml at 25 °C. (a) Explain why the recrystallization of trans-cinnamic acid must use a mixed solvent system. Please explain why the sample couldn't be successful recrystallized in ethanol alone. Calculations should be used to support your answer. (b) Calculate the % recovery and the % error for the melting point.Hg(OAc)2, H20 -CH3 NABH4 Hg(OAc)2, H20 NABH4 BH3 H202 CH3 THE OH" PHCO3H CH2CI2 (solvent) Cl2
- Question 4. phthalate and dibutyl phthalate in an inert solvent like chloroform. Both steps of this reaction rapidly establish equilibrium. In this system, would you expect adding an equimolar amount of one reagent dropwise to the other to affect the outcome of the reaction? Explain your response. Consider the acid-catalyzed esterification of phthalic acid to form buthyl (K =~1.0) H* .COOH H20 но CHCI3 СООН СООН phthalic acid butanol butyl phthalate (K=~1.0) H* но + H20 CHCI3 `COOH butyl phthalate butanol dibutyl phthalate O=U O=0 0=CTRUE OR FALSE, if false then give the correct word to make the statement true then explain 1. Sublimation occurs when a solid has a relatively high vapor pressure at a temperature [above] its melting point. 2. To isolate the desired chemical, a single extraction is [more efficient] than extracting the compound numerous times. 3. The compounds are separated in liquid-liquid extraction based on their relative solubilities in two [immiscible] liquids.Determine the mole fraction of p-dichlorobenzene dissolved in 1.00L of cyclohexane that shifts the vapor pressure from 78mmHg to 70 mmHg. Can you determine the mass of solute dissolved?