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Titration Experiment

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Introduction

Titration practical Introduction In this practical I will be using a form of quantitative analysis called titration. Titrations are often used for neutralisation reactions. I will be carrying out the practical safely and following all the precautions in the risk assessment. Materials Burette Conical flask Pipette Sodium hydroxide solution Distilled water Bromothymol blue indicator Clamp stand Hydrochloric acid Funnel Risk assessment Risk Danger Precaution Action Clamp stand could break Could cause cuts Handle carefully and at all time and secure properly Tell the teacher immediately Acid is corrosive Could harm or damage skin Handle carefully at all times Tell teacher immediately and wash off with water Method 1. First I washed out a 25 cm3 graduated pipette with sodium hydroxide solution. (0.1-mol dm3) 2. I used the pipette to measure out 25 cm3 of sodium hydroxide solution using a graduated pipette (with pipette filler) into a 250 cm3 conical flask that has been washed with distilled water. 3. I added 3-4 drops of bromothymol blue indicator 4. I secured the burette in a clamp and stand and washed a burette twice with a few cm3 of hydrochloric acid (0.1 mol dm cubed). The concentration was to be checked. 5. I carefully poured in the 0.1 mol dm3 of hydrochloric acid. (Caution: I brought the burette down to my eye level and used a filter funnel lifted slightly from the top of the burette to allow air to escape.) ...read more.

Middle

Conclusion In this practical, I was successfully able to perform a titration and now know what qualitative analysis is and have been able to form a technique of qualitative analysis. I was able to calculate the concentration of the acid used in this analysis. The results for both of the times when I carried out this practical are close to each other, although, the readings for the second time were not as close to the readings for the first time. I have also been able to find out that the acid which I was performing the titration on was more concentrated. Vocational section This section is about titration in industry. I will be writing an essay on titration in industry. Titration in industry A titration is a method in chemistry that allows quantitative analysis. By adding a reagent of known concentration until a reaction is completed (e.g. as shown by a colour change) the unknown concentration can be calculated. In this essay I will be talking about different types of titrations used in industry. Titrations are routinely used in industry to analyse products to be sold. Many manufacturers are under strict standards of quality control because their products are sold for public consumption and so they do not want to harm the public. An example of this is titrations in the pharmaceutical industry, where you have to take special care in making sure the titration goes properly. ...read more.

Conclusion

Although the colour change had only occurred in a very short period of time, I may have stopped the tap for the burette later than it had actually occurred. This would have decreased the accuracy a reliability of my results as I may have been reading of a measurement which was not the correct measurement, instead was a later (larger, as the volume increases in size as you go down the burette) measurement. The third error I may have made was that I had to repeat my practical as I had drawn in air bubbles when I was using the pipette to take in the sodium hydroxide solution. I then had to repeat my practical and carefully made sure that my pipette did not touch the surface of the beaker as I only dipped the pipette in slightly. However, after doing this carefully and ensuring I did not take in any air bubbles, my results were more accurate. Errors may also have occurred when I was calculation how much of the sodium hydroxide solution I was bringing in to the pipette. I may have brought in too little or too much of the soltuion and this could have affected my results. In this section of my assignment I will be evaluating my results and my practical. Throughout my practical I had encountered problems and weaknesses. These may have affected my results and so may have altered the final result and conclusion given from my practical. . ?? ?? ?? ?? Ahsin safdar 10JN 28/02/2008 ...read more.

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