Identification of ions and gases Assignment
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1 Name: ( ) ate: lass: Identification of ions and gases ssignment 1. n excess of sodium hydroxide is added to an aqueous solution of salt X and boiled. mmonia gas is only given off after aluminium foil is added to the hot solution. What could be X? mmonium chloride mmonium nitrate Sodium chloride Sodium nitrate 2. The scheme shows some reactions of a compound Y. What could compound Y be? aluminium sulfate calcium carbonate aluminium carbonate calcium sulfate 3. n acid X was added to a solution of the nitrate of metal Y. dense white precipitate was formed. What are X and Y? cid X Metal Y hydrochloric acid calcium nitric acid zinc sulfuric acid aluminium sulfuric acid barium 4. solution X forms a white precipitate with dilute sulfuric acid and also with aqueous silver nitrate. What could X contain? barium chloride barium nitrate magnesium chloride magnesium sulfate
2 5. 2 tests were carried out on a sample of aqueous factory waste discharge. The observations recorded are as follows. Test ropwise addition of aqueous ammonia ddition of dilute nitric acid followed by aqueous silver nitrate Results coloured precipitate formed which changed colour on standing Yellow precipitate formed Which ions could be present in the factory waste discharge? u 2+ and l u 2+ and I Fe 2+ and l Fe 2+ and I 6. 2 bottles in a laboratory are unlabelled. One bottle is known to contain aqueous sodium iodide and the other aqueous sodium chloride. Which test will identify the solutions? addition of aqueous lead(ii) nitrate addition of dilute sulfuric acid addition of blue litmus paper addition of aqueous sodium hydroxide 7. What is observed when aqueous sodium hydroxide is added to aqueous lead(ii) nitrate? a white precipitate which remains on adding excess aq NaOH a white precipitate which dissolves on adding excess aq NaOH a white precipitate which turns yellow on adding excess aq NaOH a yellow precipitate which dissolves on adding excess aq NaOH 8. The labels fell off 2 bottles each containing a colourless solution, one of which was ammonium carbonate solution and the other was ammonium chloride solution. Which of the following tests would most readily enable the bottles to be correctly relabeled? addition of blue litmus paper addition of dilute nitric acid addition of sodium hydroxide solution addition of lead(ii) nitrate solution 9. In which of the solutions will a white precipitate be observed when aqueous copper(ii) chloride is added to it? sodium hydroxide potassium carbonate lead(ii) nitrate magnesium sulfate
3 10. Solid is soluble in water. ddition of silver nitrate to the solution gives a white precipitate that dissolves in dilute hydrochloric acid. When the solution of is warmed with sodium hydroxide solution, a gas which turns damp litmus paper blue is evolved, leaving a colourless solution. (a) Name the salt (b) Write the formula of white precipitate. (c) Identify gas. (d) Write the formula of colourless solution. (e) Write an ionic equation with state symbol for the formation of white precipitate. 11. Study the reaction scheme below (a) Name substances, and : : : (b) Write down the ionic equation for the formation of.
4 12. Study the reaction scheme below and answer the questions that follow a) Identify the unknown substances W, X, Y and Z. Write their names and formulae. W: Y: X: Z: b) Write a balanced ionic equation with state symbols for the reaction between solid X and dilute sulfuric acid. c) Write a chemical equation with state symbols for the reaction between aqueous sodium hydroxide and solution Y. 13. Solution Q contains 2 anions. The scheme below shows some reactions of solution Q. Why is dil HNO 3 added to solution Q? What are the anions found in solution Q? Write ionic equations with state symbols for the formation of white ppt R and S. 5
5 14. Write down the formula of E F Give the name of Write an ionic equation to show the formation of yellow precipitate G How would you test for? What would you observe if you add aqueous ammonia to till aqueous ammonia is present in excess? 15. There was no visible observation when aq NaOH was added to an unknown aqueous solution X. When a(no 3 ) 2 was added to a new sample of X, a white precipitate formed. Suggest 2 possibilities of the identity of the cation and anion in X. What extra test could you carry out to confirm the identity of the anion in X? 6
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