How would the following experimental errors affect your experimental results while separating the components of a...

How would the following experimental errors affect your experimental results while separating the components of a counterfeit pharmaceutical (yield, purity or both) and explain why. A) you failed to dry the product completely. B)you used enough water to recrystallise phenacetin, however your Unknown was acetanilide. C)in experiment 1, you didn't extract all of the aspirin from DCM solution.

Solutions

Expert Solution

A) If you fail to dry the product completely the yiled and purity that you measure will be higher than the actual yield and purity as the water in the sample will add to the actual sample and thus give higher yield and hence higher purity.

B) when you are trying to crystallise a sample you want the solubility to be low so that you heat the solvent such that the material starts to dissolve and on colling it crystallises otu and the impuritites remain dissolved. If the solubility of a compound is high it does not crystallise you well and nthe process needs to be repeated multiple times by reducing the solvent between each attempt.

Here we are compaing phenacetin and acetanilide as per the solubility data acetanilide is more soluble then phenacetin so if you had water to crystallise phenacetin then acetanilide will remain dissolved and not precipitae out.

c) If all extraction from the the a) experiment was not completed then the yield and purity of the other compound will be shown to be higher.

queen_honey_blossom answered 1 year ago

Next > < Previous

Related Solutions

Tell how each of the following experimental errors will affect your ex- perimental results (yield, purity,...

Tell how each of the following experimental errors will affect your ex- perimental results (yield, purity, or both), and explain why. (a) You failed to dry the product completely. (b) You used enough water to recrystal- lize phenacetin, but your unknown was acetanilide. (c) In Experiment 2, you didn’t extract all of the aspirin from the dichloromethane solution. please answer the following questions with good explantion and structure if there are sturcutres.

describe and explain the possible effect on your results of the following experimental errors or vibrations....

describe and explain the possible effect on your results of the following experimental errors or vibrations. In each case, specify the component(s) whose percentage(s) would be too high or too low if: a.)After adding DCM to Panacetin, you didnt stir the mixture long enough. b.) during the NaOH extraction you failed to mix the aqueous and organic layers thoroughly c.)you mistakenly extracted the DCM solution with 1M HCL rather than 1M NaOH. d) instead of using pH paper, you acidify...

Describe and explain the possible effect on your TLC results of the following experimental errors or...

Describe and explain the possible effect on your TLC results of the following experimental errors or variations: a) The analyte spots are too large (b) The analyte solution is too dilute.

Salt Hydrolysis Lab Suggest how various experimental errors would affect your calculated values of Pka, Ka,...

Salt Hydrolysis Lab Suggest how various experimental errors would affect your calculated values of Pka, Ka, and or molarity. Clearly explain whether the calculated value would be higher, lower, or no different than the actual value. Possible experimental errors may include: a) The pH buffers used to calibrate the PH meters were 4.5 and 7.5, whereas you thought they were 4.0 and 7.0 and calibrated the pH meters accordingly. b) You decided to take the pH after each addition of...

Explain how each of the following errors would have altered your results. CLEARLY EXPALIN why your...

Explain how each of the following errors would have altered your results. CLEARLY EXPALIN why your calculations would be high, low, or unchanged. a. The pH buffers used to calibrate the pH meter were each 0.5 pH units high (4.5 and 7.5 rather than 4.0 and 7.0 respectively). b. You decided to take the pH after each addition of 5.0 mL of NaOH rather than after every 0.5 mL during the neutralization of your acid sample. c. While using the...

1) Indicate how each of the following errors would affect(increase, decrease, or no change) your calculated...

1) Indicate how each of the following errors would affect(increase, decrease, or no change) your calculated value for the molar volume of O2 at STP (assuming that you complete the experiment otherwise correctly). In each case, explain your answer. a. you forgot to subtract the vapor pressure of water in determining the pressure of O2 b. while heating your sample in the test tube your flame was improperly adjusted so that the black soot formed on the outside of the...

1) Indicate how each of the following errors would affect(increase, decrease, or no change) your calculated...

1. Explain how different experimental errors can affect the reported value of Keq.

1. Explain how different experimental errors can affect the reported value of Keq. Clearly state why the reported value of Keq would be bigger or smaller than the actual value. Examples may include: a) You thought the spectrometer was set to read trasmittance/absorbance at a wavelength of 447 nm, but it was actually set at 520 nm. b) You thought you measured the transmittance/absorbance in a cuvetter with a 1-cm pathlength, but it was actually 1.5 cm. 2. Would...

1. State and Explain how each of these errors would affect (high, low, no change) your...

1. State and Explain how each of these errors would affect (high, low, no change) your calculated values of solubility and Ksp. a) The saturated solution of Cu(IO3)2 is not filtered to remove undissolved Cu(IO3)2. b) The saturated solution of Cu(IO3)2 is filtered into a wet flask. c) You use only 5.00 mL of the saturated solution instead of 10.00 mL. 2. At the end point of a titration in the standardization of the Na2S2O3 solution (using KIO3), you have...

Explain how the following scenarios would affect the experimental Ksp value (lower, higher or no change...

Explain how the following scenarios would affect the experimental Ksp value (lower, higher or no change from acceptable value): ( the chemical used in this titration are Calcium Hydroxide, and the indicator used in this experiment are methyl orange indicator solution) a) The accidental transfer of some solid Ca(OH)2 into the titrating flask. b) The endpoint of the titration is surpassed. c) The Ca(OH)2 solution was not saturated. d) Tap water instead of distilled water was used to make all...

Subjects