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- (a) Halogen, V reacts with hydrogen gas to form HV only when heated to 200 °C in the presence of a platinum catalyst. An aqueous solution of HV is formed when HV is dissolved in water. When aqueous silver nitrate solution is added to the HV solution, precipitate W is formed. With the aid of a balanced chemical equation, explain the reaction between precipitate W and concentrated ammonia solution. () (i) The melting point of hydrogen fluoride, HF is higher than HV. Explain this phenomenon in terms of structure and bonding.Given this series of equilibrium reactions. See Image(a) Which way should the reaction to “tend” at high pH? Why?(b) Which way should the reaction to “tend” at low pH? Why? (c) What Fe(III) species would be least soluble?Your salt unknown is a colorless, granular solid. When dissolved in water it does not form a colored solution with ammonia under basic (alkaline) conditions. What cations can you conclude are not present?
- Why use ammonium carbonate to precipitate the fifth group ...Using IUPAC norms write the formulae for the following:(i) Sodium dicyanidoaurate (I)(it) Tetraamminechloridonitrito-N-platinum (IV) sulphate(1) The following unknowns were tested. Identify the anion. If none present , write " None " (a) AgNO3 test : Yellow precipitate formed , which dissolved in dilute HNO3 Bacl, test : White precipitate formed , which dissolved in dilute HCI Organic solvent test : The decane layer remained almost colorless after treatment with chlorine water Anion present_
- [Write balanced equations for the following (7a – 7d)]: (7) c) A metathesis precipitation reaction between aqueous copper (II) bromide and aqueous sodium carbonate. (supplied solubility rules will enable you to state what the precipitate is) MOLECULAR:Chromium(III) hydroxide is highly insoluble in distilled water but dissolves readily in either acidic or basic solution. Briefly explain why the compound can dissolve in acidic or in basic but not in neutral solution. Write appropriate equations to support your answer.In this activity, you will develop an experimental procedure to solve a problem. Consider the followingscenario:You are the manager of a chemical stockroom, and find a bottle containing approximately one liter of aclear and colorless solution of unknown identity and concentration. Your only clue to its identity is thatit was found between bottles of silver fluoride and sodium fluoride, so it is likely an aqueous solution ofone of those two compounds. You will need to develop a procedure to determine the following:a) The identity of the unknown solutionb) The concentration of the unknown solutionWrite out a precise procedure, which includes all glassware, reagents, and steps. You will also need towrite the calculations that you would need to determine the concentration of the solution. Assume thatyou have access to any reagent you might need
- A solution of albumin forms precipitate with silver nitrate. Another test tube containing same sample of albumin but few drops of 0.1N NaOH were added before adding the silver nitrate. Which has more precipitate, the test tube with or without NaOH? Explain.A solution of unknown group I ions gives a white precipitate with HCl.When treated with hot water, it gives a solution to which K2CrO4 is added, and a yellow precipitate forms.The white precipitate that remains after the hot water treatment dissolves completely in NH3. Which ions are present and which are not?A solution that may contain Cu2+ , Bi2+ , Sn4+ , or Sb2+ is treated with thioacetamide in an acidic medium. The black precipitate which forms is partly soluble in strongly basic solution. The precipitate which remains is soluble in 6 M HNO3 and gives only a white precipitate upon the addition of NH4OH. The basic solution, when acidified, produces an orange precipitate. Which group II ions are present? Which are absent? Which are in doubt? How would you remove all doubt?