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Preparation of a standard solution of oxalic acid and using it to standardize a solution of sodium hydroxide.

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Introduction

Preparation of a standard solution of oxalic acid and using it to standardize a solution of sodium hydroxide. Data collection Mass of oxalic acid crystals = 1.5g �0.001g Burette: oxalic acid solution made using a 250cm3 volumetric flask with an uncertainty of � 0.5cm3 Pipette: 25.0cm3 of 0.100 mol dm -3 NaOH(aq) �0.04cm3 Indicator: 3 drops of phenolphthalein End point: taken to one drop when the faint pink colour of the indicator just disappeared. Trial Volume of oxalic acid cm3 uncertainty �0.05 Observations 1 13 The solution turned colourless once this amount of acid was added. 2 12 The solution turned colourless at this volume of acid. 3 11.5 The solution was a clear light pink colour at this volume. ...read more.

Middle

+ 2NaOH(aq) (COONa)2(aq) + 2H2O(l) Concentration = amount of solute Volume in dm3 Volume = 12.2 / 1000 = 0.0122dm3 Moles = 25 / 1000 = 0.025*2 = 0.05 Concentration = 0.05 / 0.0122 = 4.09M = 4M Uncertainties Balance = 0.001/ 1.50 * 100 = 0.06% Burette = 0.5/25.0 *100 = 2% Pipette = 0.04/ 25.0 *100 = 0.16% Volumetric flask = 0.50/250*100 = 0.20% Total uncertainty = 0.06% + 2% + 0.16% + 0.20% = 2.42% Therefore concentration of sodium hydroxide = 4 � 2.42% = 4 � 2 Conclusion and evaluation The concentration of the given Sodium Hydroxide solution is 4M. This value is calculated from finding the amount (number of moles) ...read more.

Conclusion

However if the burette tap was left open for longer the solution would be clear but it would be more acidic than neutral. The balance was very sensitive to the environment; this could have increased the uncertainty of the experiment. Improvements Ensure that all the equipment is thoroughly cleaned / sterilized before use. This reduces the amount of uncertainties and ensures that the solutions are clean and not contaminated. Repeat the experiment several times so as to reduce the amount of errors and uncertainties. Read measurements correctly, keeping the eye at the correct level that would enable accurate results. Ensure that all the apparatus function correctly before beginning the experiment. Place the balance in a room where minor factors would not affect it. Use more accurate apparatus so as to decrease percentage errors. ?? ?? ?? ?? Njeri Kabanga ...read more.

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