Check List To Score A

Chapter 7: Acids and Bases and Chapter 8: Salts

A. Knowledge (Definition, meaning and facts)		Check
State the meaning of acid and alkali. What is the meaning of strong acid and weak alkali? What is neutralisation? What is salt? What is precipitate reaction?
B. Understanding / Application / Analysis
The pH value of solution ammonia in water is 9 but the pH value of solution of ammonia in trichlomethane is 7. Explain why the pH values of the two solutions are different. 80 cm3 of distilled water is added to 20 cm3 of 2.0 moldm-3 solution of HCl. Find the molarity of the dilute solution. In a titration, 40 cm3 of 0.25 moldm-3 potassium hydroxide, KOH solution is needed to neutralise 20 cm3 of nitric acid, HNO3. Calculate the molarity of the nitric acid, HNO3. Given dilute nitric acid and dilute sulphuric acid have the same concentration of 0.5 moldm-3. In a neutralisation experiment, 20 cm3 of nitric acid is required to neutralise 20 cm3 of sodium hydroxide solution but only 10 cm3 of sulphuric acid is required to neutralise 20 cm3 of sodium hydroxide solution. Explain why.
C. Synthesis
Describe a chemical test to determine a given solution is an acid solution. Describe a laboratory experiment to determine the concentration of sodium hydroxide by using titration process. You are given 0.2 moldm-3 of dilute sulphuric acid, phenolphthalein, burette, pipette and conical flask. You are given solid sodium chloride. Describe how to prepare sodium chloride solution of 0.2 moldm-3 in laboratory by using 250 cm3 volumetric flask. Describe the preparation of zinc sulphate . Describe the preparation of lead(II) chloride. Describe the preparation of potassium nitrate. Solid W is a salt. Describe the tests you would carry out to confirm the presence of zinc ions and nitrate ions in the salt? Solid X is a metal carbonate. Describe the tests you would carry out to confirm that X consists of carbonate ions besides heating. . You are given four test tubes filled with solution consist of zinc ions, lead(II) ions, aluminium ions and magnesium ions respectively. Describe the tests you would carry out to confirm the ion that present in each test tube. You are given potassium chloride solution, lead(II) oxide powder and dilute nitric acid. Describe how you would prepare lead(II) chloride salt from the given materials. You are given dilute sulphuric acid, copper(II) nitrate solution and sodium carbonate solution. Describe how you would prepare copper(II) sulphate salt from the given materials.