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- What are the types of gravimetric methods? Give an examples where each method is used in an analysis. What is particulate gravimetry? When do we use this 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…B) Assess the critical aspects of chemistry involved in sedimentatic
- 1. Write a report comparing the principles, limitations/capabilities of the following microscopic techniques. (a) Optical Microscopy(b) Scanning Electron Microscopy(c) Transmission Electron Microscopy(d) Atomic Force MicroscopyWhat is the difference between Class A and Class B glassware? Which Class (Aor B) would be better suited for preparing non-analytical experiments? Provide a brief reason for your selection2. 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?
- (i) Explain the term combinatorial chemistry, and discuss its significance for the drug discovery. (ii) Describe the main techniques used for combinatorial chemistry.Bone is a biomaterial also referred to hydroxyapatite containing mostly calcium phosphate. Related with the strontium amount analysis of this material, which one correctly states the sample-analyte-analysis, respectively?In the Analytical Chemistry laboratory, one of the B.Sc student Ms. Fatma wanted to analyze the presence of Iron(II) ion in the water samples collected from Sohar Industrial Area in the Sultanate of Oman and analyzed by Spectrophotometric method. (1) 250.00 mL of this water sample (Solution A) known to contain unknown amount of FeSO4. She has diluted Solution A by a dilution factor 10 to make 250.00 mL solution, which she labeled Solution B. Using Spectrophotometer, she has measured the absorbance value (0.642) for Solution B at 508 nm using 1.00 cm cell (cuvet). The molar absorptivity value for Fe2* ion at 508 nm is ɛ508 = 30.8 M-1cm1. (i) What volume of the solution A did she require to make the 250.00 mL of Solution В? (ii) in (i)? What instrument should she use to transfer the volume of the Solution A calculated (ii) Concentration of FeSO4 in Solution B. (iv) Concentration of FeSO4 in Solution A. Mass of FeSO4 in Solution A (Show your calculation) (v)
- II. b) What is the difference between liquid-liquid, solid-liquid and solid-phase extraction? Complete the table below and sort the following examples in the correct column: Steeping tea, washing an organic phase (workup), brewing beer, chemical desalting of crude oil, activated carbon sugar decolorization. liquid-liquid solid-liquid solid-phase Phase that contains analyte before extraction? Phase that contains analyte after extraction? Example(s)(4) Treatises are (a) A comprehensive presentation of broad area of chemistry. (b) Books of comprehensive discussions of contemporary knowledge in a limited field. (c) Contain complete reports of the research work that are done for advanced academic degree. (d) The paper of conference may be published in a separate volume rather than journals. (5) Aldrichimica Acta is an example on periodical published by (a) Chemical and scientific societies (b) Private companies (c) universities (d) Private industriesWhat are the advantages and disadvantages of volumetric and gravimetric analysis?