To draw and explain the shape Essay

Published: 2020-02-17 13:52:32
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Category: BTB

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To draw and explain the shape of graphs of pH against volume of titrant for titrations involving monoprotic acids and bases. The combinations we had were: 1) strong acid + strong base (titrant), 2) weak acid + strong base (titrant) and 3) weak base + strong acid (titrant). Data collection: Procedure: We had the different acids and bases in the beaker respectively in the burette and dropped the titrant into the beaker where we had a pH-meter and recorded the result. 1) We had HCl in a 20 ml beaker and NaOH in a 50 ml burette and a few drops of BTB.

2) We had HAc in a 20 ml beaker and NaOH in a 50 ml burette and a few drops of BTB. 3) We had NH3 in a 20 ml beaker and HCl in a 50 ml burette and a few drops of BTB. The results were all rather similar; the graph curves were almost the same shape, even though the values differed from the one to another. *For more information, see attached graphs.  Data processing and presentation: All the results were very much similar producing very similar graphs.

Of course there are uncertainties present. For example it is easy to put in a few drops too much from the burette and the thing is not so accurate any more. Also pouring the liquids backs and forth-through beakers and burettes etc. leads to the losses of a few drops here and there. The strong acid strong base graph (no. 1) is shaped like this because of the fact that both the liquids are strong. A strong acid reacts to 100%, and so does a strong base. As acids, when they react, give away hydrogen ions or protons they are called proton-donors.

On the other hand, bases work in the opposite way, taking up hydrogen ions or protons and are therefore referred to as proton-acceptors. Obviously a donor and an acceptor work very well together and therefore react very easily, to 100%. Conclusion and evaluation: To conclude Id like to say that it was very interesting to conduct this experiment. There were many interesting steps to go through etc. Looking at the tree different graphs we got from our three attempts, they are all very similar. This leads me to the conclusion that they are correct.

As we have no literate value to compare it with I can interpret it as that we got where we wanted. Of course the process can always be better and improved. But I think the method we used here is rather accurate, accept for the uncertainties due to bad measurements. The use of BTB as an indicator makes it very clear to see when the solution is acid respectively basic, which is an advantage. On the other hand, the intervals we dripped the titrant into the other liquid were not even which does not give a good result. It can always be improved.

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