An aqueous solution was known to contain the these anions: CO, Cr, PO, SO 4 > 3 The following tests were conducted. addition of silver nitrate addition of excess dilute HNO Addition of barium nitrate Explain how these tests should be conducted to separate the four ions.
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- Explain why colour of KMnO4 disappears when oxalic acid is added to its solution in acidic medium.a) Which ion, Pt(II) or Mn(II), is more likely to form a sulfide in the presence of H2S in water. b) Rationalize your answer with the trends in hard and soft character. c) Give a balance chemical equation from your reaction.The oxide of a metal M was water soluble when a blue litmus strip was dipped in This solution, it did not go any change in colour. Predict the nature of oxide.
- You want to separate Cd2* and Fe2+ (initial concentration 103 mol/L) by means ofprecipitation of the corresponding sulphides. Is therea pH range in which one of the two metals is precipitated quantitatively(concentration in the solution less than or equal to 10" mol/L) is precipitatedwhile the other is still completely_in solution?Calculate and name this pH range where pH values below 0are set equal to O. Illustrate the situation graphically by drawingAn unknown salt X reacts with hot conc. H2SO4 to produce a brown coloured gas which intensifies on addition on copper turnings. On adding dilute ferrous sulphate solution to an aqueous solution of X and then carefully adding conc. H2SO4along the sides of the test tube, a brown complex Y is formed at the interface between the solution and H2SO4. Identify X andY and write the chemical equation involved in the reaction.Identify the type of coprecipitation that occurred in the following situation. (a) The precipitation of bulky precipitates (e.g. MgNH4PO4) traps significant amount of the solution in the crystalline precipitate. ____________ (b) The formation of equimolar replacement (Al, Fe) 203 during the precipitation of hydroxides in a solution containing A13+ and Fe3+ _____________ (c) The coprecipitation of soluble ions (e.g. Na+ and CI) in the solution because of the absorption of electrolytes by colloidal precipitates. _____________ (d.) Dust particles may coprecipitate as crystals grow on the surface of the dust particles. ___________ (e.) lons in the solution may be trapped inside the precipitate during the crystal growth process.___________ Fill in the blanks with the following choices: occlusion, mechanical entrapment, surface absorption, mixed crystal formation
- A pink solid has the formula CoCl3·5NH3·H2O. A solution of this solid is also pink in color and when titrated with silver nitrate quickly forms 3 mol of AgCl. Upon heating the pink solid, it loses 1 mole of water and forms a purple solid with the same NH3:Cl:Co ratio. Dissolving and titrating with AgNO3, the purple solid slowly releases one of its chlorides. a) Derive the formulas of the two octahedral complexes.b) draw and name them.c) write the chemical equations of all described reactions.Chromel is an alloy composed of nickel, iron and chromium.A 0.6472 g sample was dissolved and diluted to 250 mL. When a50 mL aliquot of 0.05182 M EDTA was mixed with an equal volumeof the diluted sample and all the three ions were chelated, a 5.11 mLback titration with 0.06241 M copper (II) was required.The chromium in a second 50 mL aliquot was masked through theaddition of hexamethylenetetramine, titration of the Fe and Nirequired 36.28 mL of 0.05182 M EDTA.Iron and chromium were masked with pyrophosphate in a third50 mL aliquot and the nickel was titrated with 25.91 mL of theEDTA solution.Calculate the percentage of nickel, chromium and iron in thealloy.What are the expected results when these following metals and non-mentals would react to HCL & CUCL2?
- Which of the following statements is true regarding permanganimetry? a) Permanganate solution can oxidize water which is catalyzed by the presence of manganese dioxide or manganese ion. b) The light pink endpoint color for permanganimetry tends to fade with time due to the catalytic reaction. c) Standardization of the permanganate titrant is carried out at elevated temperature with sodium oxalate. d) all of these e) none of theseComparing the two quantities based on the given condition, which is greater I or II? or are they equal? can the quantities be measured? Consider the analysis of Fe in ore using permanganate as titrant. Under the same acidic conditions I. % Fe with pre-reduction II. % Fe without pre-reductionConsider the coordination complex with the formula [CoBr(NH3)5]SO4. Identify the Lewis acid(s) and Lewis base(s) in the complex and explain how you made your choice(s). What is the coordination number for the transition metal cation in this complex? Explain how you know.