In gravimetric analysis, long digestion times allow for the formation of larger crystals remove impurities in the crystals can result in post-precipitation A) 2 only B) 1 only C) 1, 2 and 3 D) 3 only E) 1 and 2
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In gravimetric analysis, long digestion times
- allow for the formation of larger crystals
- remove impurities in the crystals
- can result in post-precipitation
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- a) Give any one practical example of adsorption phenomena. b) Mention any FOUR (4) applications of adsorption in chemical analysis.A series of reactions is carried out on the alloy (A) formed of two metals, as in the following scheme : Amount of ppt. (B) +H2SO4(aq) +NAOH(ag) +NaOHçaq) Decreases and a Alloy Aqueous solution Ppt. (B) white green ppt. remains What are the two metals forming alloy (A)?.. a) Copper and aluminum b) Copper and iron c) Iron and aluminum d) Iron and lead.4m K R EMetals H X Se.com/u/1/c/MTUAMTYZNTK2OTM3/a/Mig0NjcAMzk0ODA4/delails tals Homework Packet 18.pdf Oper wth UNDERSTANDING ORES Most ores look like ordinary rocks. You would not guess that they contain shiny metal. The earth's crust is made up of many minerals. Minerals can be defined as naturally occuring chemical elements and compounds. People have discovered more than 2,000 different minerals. Many of these contain metals. But because the metal elements are linked with other elements in the minerals, the metals do not show all of their properties. Figure A 1. Most minerals are elements, compounds 2. In order to free the metal from the other elements, a mineral must be synthesized, decomposed Page 3 I 6 Q +
- Describe liquid-liquid extraction. Provide at least one application for liquid-liquid extraction in industryQuestion 27 of 40 Submit Construct the expression for Ksp for solid Ba3(P04)2 in aqueous solution. Вa:(РOq)2(s) — З Ва" (аq) + 2 РО," (aq) 1 Based on your knowledge of how the solid will dissociate in aqueous solution, use the tiles to form the expression. Ksp ORESET [Ba3(PO4)2] 2[Ba3(PO4)2 3[Ba3(PO4)2 [Ba3(PO4)2l° [Ba3(PO4)21° [Ba*] 3[Ba] [Ba*j [Ba²*] 3[Ba2*] [Ba*j* [PO,*] 2[PO,] [PO,*]? [PO,] 2[PO,] [PO4]? 3[PO,*] [PO,*]°Suppose you wanted to analyze the amount of metal in the alloy. For example, you might want to determine the nickel (Ni2+) content in alloy material. (a) Using gravimetric analysis, propose precipitating method to analyze nickel (Ni2+) in alloy and write 8 steps required during the precipitation. Also, suggest an appropriate solvent and its ratio dissolve the mixture. Here we recommended using dimethylglyoxime (H2DMG) as an organic precipitating agent.(b) Suppose the nickel had been precipitated from the alloy (2.0980g) using dimethylglyoxime (H2DMG) as an organic precipitating agent and giving a precipitate of complex nickel dimethylglyoxime (Ni(HDGMG)2) weighing 0.2370g. Calculate the percentage weight of nickel (Ni2+) in the alloy sample.
- Write two applications of adsorption.The purpose of digestion process in gravimetric analysis is to: 1. O decrease the particle size of the precipitate 2. O evaporate the solvent 3. O dry the precipitate 4. O coagulate the precipitateWhat is the concentration of PO43 ions in a satured solution of Mg3(P04)2? The Ksp of Mg3(PO4)2 is 1.04 x 1024. -10 2.55 x10 M Incorrect
- Which of the following salts does NOT cause permanent hardness? A FeCl, B CaCl, © Ca(HCO,), (НСО ,), D MgSO 4(2) Boron is diffused into an intrinsic Si sample, giving the acceptor distribution shown in the Figure below. N a. Sketch thee equilibrium band diagram, and show the direction of the resulting electric field, for N(x)>>n¡ b. Repeat it for phosphorus diffusion for N(x)>>N;What is the ionic strength of a 2:1 electrolyte with a concentration of 0.018 M? (2:1 means the formula of the neutral compound has 2 moles of one element for 1 mole of the other)