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- 2. The goal behind suction filtration is to remove soluble impurities that are on the surface of the crystals. Therefore, why can't you simply use suction filtration instead of recrystallization to purify an impure solid?What parameters should be considered when choosing between distillation methods? Are there any differences in equipment or technique?PAPER CROMATOGRAPHY • Define chromatography • Demonstrate an understanding of the process of chromatography • Describe the steps involved in a chromatography investigation Explanation Coloured inks are often made up of several different inks. Each colour of ink will get carried a different distance by the water, allowing you to see all of the different inks. Try this with different colours to see what actually goes into a colour. This technique is called chromatography and can be used in chemistry to find out what is in an unknown mixture. II. Materials .Felt tip pens (non-washable) . Kitchen roll .A bowl or cup . Water • Scissors III. Health and safety • Make sure that you thoroughly clean any equipment after the experiment before using for food IV. Procedure Method 1 1. Take a sheet of kitchen roll and draw a simple picture with a non-washable felt tip pen. 2. Place the sheet over an empty bowl. This is to keep the paper from getting too wet. 3. Carefully add a few drops of water…
- 3. What is particulate gravimetry? When do we use this technique? 4. What are the conditions for a successful gravimetric analysis. 5. Define nucleation. What conditions are important for this stage.(i) Name three common uses of High Performance Liquid Chromatography (HPLC) in the laboratory. b.Chromatography (DRUG TEST) Thin-layer chromatography (TLC) Gas chromatography (GC) Liquid chromatography (LC) (i.e, high performance liquid chromatography or HPLC)
- how to use Gas Chromatography in Cosmetics Provide a procedure on how to do this example that you provided. Explain the procedure and what data would you gather?Multiple Choice Each of the numbered items or incomplete statements is followed by answers or by completions of the statement. Select the one lettered answer or completion that is best in each case. Write your answer before each number. 24. approach 100% purity and are used to standardize solutions at a very high degree of accuracy. a. USP grade C. Chemical pure grade b. Technical grade d. Primary standard grade 25.A buret with a glass stopcock can be used for: a. Aldehydes C. Acids b. Alcohols d. Bases 26. The following are used in the assay of ZnO, EXCEPT a. Sodium hydroxide C. Ammonium chloride b. Sulfuric acid d. Methyl red IWhen isolating a solid compound after recrystallization, which is the appropriate technique to use, vacuum filtration or gravity filtration?
- Write few applications of fractional distillationIn what order should the following methods be used to separate a mixture containing sand-sugar-alcohol and water into its components? 1) Adi distillation II) Fractional distillation HII) Filtration under vacuum B. II, I, II C. III, I, II D. 1, III, II E III, II, IWhat could have gone wrong in the separation and purification process to result in the disparity from the observed and expected yields? Select all that apply A) Both the benzoic acid and sand may have been wet before the student recorded the masses, hence the increase in expected masses. B) The student may have filtered the benzoic acid while cold. Hence the sand could have been contaminated with benzoic acid and resulted in a higher mass for sand. C) The sand may have dissolved in the hot water along with the benzoic acid, hence, the recorded mass for benzoic acid was more. D)The benzoic acid may have been cooled down too quickly on ice thereby allowing other soluble impurities to crystallize with benzoic acid causing the increase in the expected mass