Describe and explain the effect(s) on your result for the following possible experimental errors. In each case, specify the component(s) whose percentage(s) would be too high or too low and explain your rationale why these would be changed. (a) After adding DCM to the counterfeit pharmaceutical at the beginning, you didn’t stir or shake the mixture before filtering. (b) Washing the sucrose recovered during the first vacuum filtration with water rather than DCM. (c) During the NaHCO3 extraction, you failed to mix the organic and aqueous layers thoroughly. - B (d) You mistakenly extracted the DCM solution with 5% HCl rather than 5% NaHCO3. (e) You neutralised the NaHCO3 solution to pH7 rather than pH2.
Describe and explain the effect(s) on your result for the following possible experimental errors. In each case, specify the component(s) whose percentage(s) would be too high or too low and explain your rationale why these would be changed.
(a) After adding DCM to the counterfeit pharmaceutical at the beginning, you didn’t stir or shake the mixture before filtering.
(b) Washing the sucrose recovered during the first vacuum filtration with water rather than DCM.
(c) During the NaHCO3 extraction, you failed to mix the organic and aqueous layers thoroughly. - B
(d) You mistakenly extracted the DCM solution with 5% HCl rather than 5% NaHCO3.
(e) You neutralised the NaHCO3 solution to pH7 rather than pH2.
Step by step
Solved in 3 steps
