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for spm students...prepare for perfect score

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  2. 2. SUMMARIZE<br />Physical properties acid and base<br />Chemical properties acid and base<br />Role of water<br />Concentration of ion, pH value, strong-weak acid/alkali<br />Concentration of Acids/Alkali (g/dm3) or (mol/dm3)<br />Preparation of solution (Standard solution/dilution method)<br />Neutralisations (Titration method)<br />
  3. 3. Frequent questions in SPM Exam<br />
  4. 4. Favourite Questions<br />STRUCTURE QUESTIONS<br />1st<br />Sulphuric acid <br />1.0 moldm-3<br />25.0 cm3 of potassium hydroxide solution and a few drops of phenolphthalein<br />White tile<br />
  5. 5. 2nd<br />25<br />0<br />26<br />1<br />Potassium hydroxide solution<br />Initial titration<br />Final titration<br />Favourite Questions<br />STRUCTURE QUESTIONS<br />* Note : Burette reading MUST BE in 2 d.p and end with 0 or 5<br />
  6. 6. 3rd<br />Favourite Questions<br />STRUCTURE QUESTIONS<br />EX. 1<br />EX. 2<br />EX. 3<br />
  7. 7. 4th<br />Dry glacial ethanoic acid<br />Dilute hydrochloric acid <br />0.1 moldm-3<br />Aqueous solution of ethanoic acid 0.1 moldm-3<br />Blue litmus paper<br />Blue litmus paper<br />Blue litmus paper<br />Favourite Questions<br />STRUCTURE QUESTIONS<br />P<br />Q<br />R<br />
  8. 8. 5th<br />Favourite Questions<br />STRUCTURE QUESTIONS<br />EX. 2<br />EX. 3<br />EX. 1<br />
  9. 9. 6th<br />Favourite Questions<br />STRUCTURE QUESTIONS<br />Add water<br />* Dilution method = to prepare low concentration solution from high concentration solution<br />
  10. 10. 7th<br />Favourite Questions<br />ESSAYQUESTIONS<br />PAPER 2:<br />(a) (i) What is meant by ‘standard solution’ ?,[1 mark]<br /> (ii) Describe how 100cm3 of 2.0 moldm-3 sodium hydroxide solution can be prepared in the school laboratory, Your description should include the calculation.<br /> Use the information, Relative atomic mass of Na = 23, O =16 , H = 1 [7 marks]<br />(i) Standard solution is a solution with known concentration<br />(ii) Calculation:-<br />Moles of NaOH needed = 2.0 x 100/1000 = 0.2 mol<br />Mass of NaOH = 0.2 x 40 = 8 g<br />1. Weigh exactly 8.0g NaOH<br />2. Add a little distilled water to dissolve NaOH in<br />a beaker/ container . Stir<br />3. Transfer solution into 100 cm3 volumetric flask<br />4. Rinse beaker / container with distlled water .Transfer into the volumetric flask.<br />5. Add distilled water into volumetric flask up to the mark // exactly in line with<br />calibration mark.<br />6. Volumetric flask stoppered/ closed and shake<br />