You are provided with the following: Solution coded K1, a solution of sulfuric acid of unknown concentration Solution K2, a standard sodium hydroxide solution prepared by dissolving 4.00 g of NaOH in 1 dm³ of solution Phenolphthalein indicator Instruction: Titrate K1 (from the burette) against K2 (in the conical flask) using phenolphthalein as the indicator. Record your results including one rough and three accurate titrations.

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You are provided with: 0.1 M hydrochloric acid labeled Y1 0.1 M magnesium ribbon labeled Y2 Stopwatch and thermometer Follow the procedure below: (i) Add 5 cm³ of Y1 into a clean test tube. (ii) Add a fixed length of Y2 magnesium ribbon into the acid and quickly start the stopwatch. (iii) Record the time taken for the effervescence (bubbling) to stop. (iv) Repeat steps (i)–(iii) using warmed Y1 solutions at 40°C, 50°C, 60°C and 70°C. (v) Record the temperature and time values for each trial.

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You are given a salt labeled W, which contains one cation and one anion. Carry out the following tests to determine its identity: (a) Describe the appearance of salt W. (b) Heat a small amount of dry salt and observe any changes. (c) Test solubility in water. (d) Add aqueous sodium hydroxide dropwise, then in excess. (e) Add aqueous ammonia dropwise, then in excess. (f) Add dilute nitric acid, then barium nitrate solution. (g) Add silver nitrate followed by dilute nitric acid.

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