Match the following tests to their corresponding positive visible result. v Ethanolic AGNO3 I. formation of silver mirror Chromic Acid Test II. formation of white precipitate lodoform Test III. formation of 2 layers v Tollen's Test IV. formation of blue solution v 2,4-DNP Test V. formation of yellow precipitate VI. formation of brick-red precipitate v Lucas Test v Fehling's Test VII. blue-green solution VIII, formation of yellow solution IX. formation of yellow to orange precipitate
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- 1. These are balances that have a maximum loading of 10 to 30 g with a precision of 60.01 mgA. semi-microanalyticalB. MicroanalyticalC. MacrobalancesD. Triple Beam Balance2. Which type of curve is normally produced when plotting the change in the concentration of a specie of some function and the amount of reagent added?A. Titration curveB. Sigmoidal CurveC. Phase Transition curveD. Calibration curve3. In the dead dear case study, silver diethyldithiocarbamateforms a colored solution when it binds with arsenic, what do we call substance like silver diethyldithiocarbamate?A. Secondary standard reagentB. Precipitating agentC. Chelating agentD. Primary standard reagent1. Which among these is/are desirable properties for the type of precipitate required in gravimetric analysis? I. large particles III. known composition A. I only II. reactive with atmospheric constituents IV. small particles C. I & III В. I & II D. III & IV Е. I, П, I19. What type of sample analysis usually operates on the 10-4 g scale of sample size? A. macro analysis C. micro analysis B. semi-micro D. ultra-micro analysis analysis 20. Under what classification does a constituent group when its concentration is between 100 ppm and 1ppb? A. Major constituents B. Interferences C. Minor D. Trace constituents constituent
- To prevent inclusion from occurring during precipitation, the technique to follow is I. filter precipitate with less porous paper II. crystal growth be made to occur more slowly II. use of dilute analyte with concentrated precipitant IV. addition of soluble electrolyte O I & II I O I l only O Iv only O II & IV O I only1. One of the methods of eliminating interferences, is by adding solvents to the solution in which components to be removed are soluble, which method is this? a. Complexation b. Extraction lon-exchange d. Precipitate С. 2. Which of the following properties of precipitates is desired in gravimetry? a. Large b. Pure С. Free of contaminants d. All of the choicesIvan B. Garcia A. What is the acid/base ratio? Why is it important in the titrimetric process? B. Why should you boil the sample solution right before reaching the end point? c. Does the primary standard used for the standardization of HCI fit the criteria for a good primary standard? Why or Why not?
- Match the following titration methods to their corresponding end points. Permanganate Dichromate Iodimetry Iodometry A. purple solution B. colorless solution C. pale yellow solution D. deep intense blue solution E. light pink solution25.0 cm3 of sodium hydroxide solution is tritrated against 0.200 mol dm–3 hydrochloric acid until the indicator just changes colour. 27.5 cm3 of the acid are required to reach the end point.Which of the following pieces of apparatus should be used to transfer 25.0 cm3 of the sodium hydroxide solution?a. Burette b. Pipette c. Measuring cyclinder d. Volumetric flaska. Calculate the base saturation using the following given miliequivalent weights obtained from a 25g soil sample (a. Ca++= 2.23 m.e.; b. Mg++=1.32 m.e.; c. Na+= 1.98 m.e.; d. K+= 1.87 m.e.; e. H+= 1.27 m.e.; f. Al+++= 0.11 m.e.; g. NH4+= 2.3 m.e.; h. NO3-= 1.5 m.e. b. Calculate the CEC (m.e./100g soil) using the following given miliequivalent weights obtained from a 25g soil sample (a. Ca++= 2.23 m.e; b. Mg++=1.32 m.e.; c. Na+= 1.98 m.e.; d. K+= 1.87 m.e.; e. H+= 1.27 m.e.; f. Al+++= 0.11 m.e.; g. NH4+= 2.3 m.e.; h. NO3-= 1.5 m.e.
- 17. This type of analysis implies that the constituent determined was present in very, very low concentration. a. Macro analysis b. Semi-macro analysis c. Micro analysis 18. Which of the following does not happen during digestion? The crystals dissolve and re-precipitate under equilibrium conditions. b. Weakly bound water are lost from the precipitates. c. Filterability improves d. None of the choicesIn which solution will 0.000015 BaCl2 form a participate?a. 7.0x10^-7 M H2SO4 (ksp of BaSO4 = 1.1x10^-10)b. 0.10 M Pb(NO3)2 (ksp of PbCl2 = 1.7x10^-5)c. 0.010 M NaF (ksp of BaF2 = 1.7x10^-6)d. 5.0x10^-7 M AgNO3 (ksp of AgCl = 1.8x10^-10)i5. OmL of phosphonic is titrated w/ 28-3m2 ofa O.520M Solution of potassium hydroxicen what is the concentration of phosphon'cacic? H3POyla9) t 3 KOH(ag)-723 POulaq) +3H20(1.