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Standardizing a Sodium Hydroxide (NaOH) Solution

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Introduction

´╗┐Standardizing a Sodium Hydroxide (NaOH) Solution Aims: The aim of this practical is to prepare a NaOH solution, determine the Concentration of the NaOH solution accurately and precisely and calculate of unknown concentration from titration results. Introduction: (i) Concentration of solutions: Although there are many different units of concentration, the most commonly used unit among chemists is morality (M). Molarity is defined as the number of moles of solute per 1-L of solution. The main advantage of molarity as a unit of concentration is therefore the ease with which measurements of the volume of a solution can be combined with the molarity to determine the number of moles of the solute that are present to take part in a chemical reaction. (ii) Standardization: The process of using a known amount of one reagent to determine the concentration of another reagent is known as standardization. This will allow the experiment to be accurate determination of the concentration of NaOH solution, which is linked to standardized can be provide accurately help the experiment. ...read more.

Middle

Titrations that use phenolphthalein as the indicator, for example, should be stopped just before the solution turns a permanent pink colour. (1) Lewis, R., Evans, W., 2011 Materials: The chemicals that were used in this experiment were phenolphthalein indicator, water, hydrochloric acid, sodium hydroxide and potassium acid phthalate. The apparatuses that were used in this experiment were burette, beaker, pipette, analytical balance, dropper, conical flask, glass rod, and volumetric flask. Methods 1. Weigh accurately mass approx. 5 g of potassium hydrogen phthalate (KHP) into a weighting boat record the mass to the three or four decimal place. 2. Transfer to a beaker and add distilled water. Swirl the baker or with glass rod until the solid is completely dissolved. 3. Carefully place a stirring magnet into 250cm3 volumetric flask and make up to mark with distilled water and shake well. 4. Pipette a 25cm3 amount of this into a conical flask. Add two or three drops of phenolphthalein. 5. Now fill the burette with the sodium hydroxide solution and remove any air bubbles from the tip of the burette. 6. ...read more.

Conclusion

= = 0.95moldm3 Discussion Conclusions By carrying out this experiment a key finding was established of example the amount of so hydroxide solution required to provide an experiment neutralise a 25.00cm3 of potassium hydrogen phthalate solution. The experiment results had been repeated over three times to allow the results to be as accurate as possible, factors which could limit the experiment; such as the meniscus line on the burette could have been misread which led to obtain inaccurate volume of NaOH used in the experiment. Also the color changes within an indicator could affect the outcome of the end reaction lead to a false reading with the burette. The results were used to calculate the molarity with both solutions. During any experiment it?s important to reduce and minimise errors one way would be to repeat experiment over many times as possible. Also this will provide accurate results as there will be more comparative within the experiment, by carrying repeats this will allow the experiment to become reliable and valid. The experiment overall was successful as the aim of this experiment was achieved within a safety environment. 1. Lewis, R., Evans, W., 2011. Chemistry Palgrave foundations.4th ed. Hampshire: Palgrave Macmillan. ...read more.

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