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Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
Revision on acid base and salt = with answers
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Revision on acid base and salt = with answers

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Basic chemistry concept

Basic chemistry concept

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  • 1. Chemistry revision form 5 - 2011 <ul><li>Topic </li></ul><ul><li>acid base and salt </li></ul>
  • 2. <ul><li>a) Soluble and Insoluble salts </li></ul>Chlorides salts Sulphates salts soluble salts All soluble except All soluble except Insoluble salts
  • 3. <ul><li>a) Soluble and Insoluble salts </li></ul>Nitrate salts carbonate salts soluble salts All soluble Insoluble salts All insoluble except
  • 4. SALT PREPARATION METHODS SOLUBLE SALTS ( must start with ) TITRATION METHOD ( reaction between and ) SOLID AND HOT ACID METHOD For soluble salts of salts For all soluble salts
  • 5. SALT PREPARATION METHODS INSOLUBLE SALT ( the reactants must be in form) METHOD
  • 6. Excess copper (II) oxide powder Acid xxxxxxxxxxxx Heat
  • 7. <ul><li>State the colour of </li></ul><ul><li>copper (II) oxide powder </li></ul><ul><li>copper(II) sulphate solution </li></ul><ul><li>Based on Diagram, name the acid used to prepare copper (II) sulphate. </li></ul><ul><li> </li></ul>
  • 8. Write the chemical equation for the preparation of copper (II) sulphate. State the reason why copper (II) oxide powder is added until in excess.
  • 9. Describe how to obtain pure crystals from solution of copper (II) sulphate in the beaker above.  
  • 10. 0.1 mol of copper (II) sulphate is produced from the reaction between acid and excess copper (II) oxide. Calculate the mass of copper (II) sulphate formed.
  • 11. Describe chemical tests to verify the present of cation in copper (II) sulphate solution.
  • 12. Describe chemical tests to verify the present of anion in copper (II) sulphate solution.
  • 13. Question 3 Preparation of salt Name of method: i.Titration 0.1 mol dm-3 hydrochloric acid method of preparation of salt Experiment 1 25.0 cm3 of 0.2 mol dm-3 sodium hydroxide + phenolphthalein
  • 14. <ul><li>Experiment 11 </li></ul>10 cm3 of 1.0 mol dm-3 lead(II) nitrate solution Excess potassium iodide solution Name of method: Double decomposition (precipitation)
  • 15. <ul><li>b.Experiment 1 </li></ul><ul><li>i.Name reaction </li></ul><ul><li>Neutralization </li></ul><ul><li>ii.Chemical equation </li></ul><ul><li>NaOH + HCl  NaCl +H 2 O </li></ul>
  • 16. <ul><li>iii. Colour change of phenolpthalein </li></ul><ul><li>Pink to colourless </li></ul>
  • 17. <ul><li>iv. Calculate Volume of HC l needed </li></ul><ul><li>Mole of NaOH= 25 x 0.1/1000 =0.005 </li></ul><ul><li>From the equation, </li></ul><ul><li>0.005 mol NaOH  0.005 mol HCl </li></ul><ul><li>But mole = MV/1000 </li></ul><ul><li>So V = mole x 1000/M </li></ul><ul><li>V = 0.005 x 1000/0.1 </li></ul><ul><li>V = 50Cm 3 </li></ul>
  • 18. <ul><li>c. Experiment II </li></ul><ul><li>i.Name of salt </li></ul><ul><li>Lead(II) iodide </li></ul><ul><li>Ii. Write Ionic equation </li></ul><ul><li>P b 2+ + 2I -  PbI 2 </li></ul>
  • 19. <ul><li>Iii How pure salt is obtained from the reaction II? </li></ul><ul><li>Filter the mixture </li></ul><ul><li>Rinse residue with distilled water </li></ul><ul><li>Dry between two filter papers </li></ul>
  • 20. <ul><li>iv. Calculate maximum mass of precipitate X </li></ul><ul><li>Mole of Pb(NO 3 ) 2 = 10x1 /1000 </li></ul><ul><li> = 0.01 mol </li></ul><ul><li>But </li></ul><ul><li>0.01 mole Pb 2+  0.01 mole PbI 2 </li></ul><ul><li>So mass of PbI 2 = mole x mmass </li></ul><ul><li>= 0.01x(207+ 2(127))g </li></ul><ul><li> =4.61 g </li></ul>
  • 21. <ul><li>Question 4 </li></ul><ul><li>Action of heat on salts </li></ul><ul><li>+ </li></ul><ul><li>Name gas Q </li></ul><ul><li>CARBON DIOXIDE </li></ul><ul><li>name of COMPOUND x </li></ul><ul><li>Copper (ii) carbonate </li></ul>Compound X Copper (II) oxide Gas Q ∆
  • 22. <ul><li>State the colour of </li></ul><ul><li>COMPOUND X </li></ul><ul><li>COPPER(II) OXIDE </li></ul>GREEN BLACK
  • 23. <ul><li>(III) Chemical equation for decomposition of compound X </li></ul><ul><li>CuCO 3  CuO + CO 2 </li></ul><ul><li>(iv) If copper(II) nitrate is heated to replace compound X, write chemical equation </li></ul><ul><li>2Cu(NO 3 ) 2  2CuO+ </li></ul><ul><li>4NO 2 + O 2 </li></ul>
  • 24. <ul><li>thank you </li></ul>&quot; Your potential as a human being…is unlimited. You have within you the ability to become and to achieve anything you want.&quot;

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