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Calibrating pH meters

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Calibrating pH meters Introduction pH, a term commonly used but understood. The term pH simply is the indication the hydrogen ion concentration of a solution. The abbreviation stands for the French words 'pouvoir hydrog´┐Żne' which simply means hydrogen power. pH is one of the most common laboratory measurements because many chemical processes are dependent on pH. In our modern lives, virtually everything we use has been tested for pH at one time: from the tap water we brush our teeth with, the paper we write on, the food we eat, to the medicines we take, at some point a pH measurement was performed. Although everyone is familiar with Litmus paper, the only reliable way to measure pH is using electrodes. These electrodes essentially monitor the changes in potential voltage caused by differing concentration of Hydrogen ions. Aim: Within this experiment I will be using a Ph meter to identify the pH of three unknown substances. Before conducting the experiment we will also be required to calibrate the pH meters for it to read the pH accurately of the unknown chemicals. The purpose of calibrating the pH meter is so the u can be 99%sure the ph mete is giving of an accurate reading as it is known that accuracy is one of them most factors when conducting an experiment. ...read more.


* pH meter- An electronic device used to measure the hydrogen ion concentration in a solution. * Deionized water- Water that has been deionized. * Screwdriver- A tool used to turn screws * Goggles - Plastic goggles designed to protect the eyes Once the equipment had been gathered it was placed and was set-up in the centre of the table. All the chemical solutions where poured in to individual beakers once this had been done the pH meter had been switched on and activated ready for use. The electrode of the ph meter had been placed in to the buffer solution and had been calibrated by adjusting the screw at the top of the ph meter so it read pH 7. Once the pH from the buffer solution after the pH meter has been calibrated and was rinsed thoroughly with deionised water. After the electrode has been rinsed it was placed in to the 1st unknown solution and the pH reading was recorded. After we had recorded the pH reading we then removed the electrode from the solution and was rinsed thoroughly with deionised water. This process was repeated with the other 2 unknown chemicals. ...read more.


On the other with all the human error I think the accuracy was not as good as it could have been. I think that the method and the equipment and the materials for this experiment are great for maximum accuracy but they do not eliminate the chance for human error. Over all out of the whole experiment I enjoyed the theory the most due to the fact that it enhanced me knowledge about preparing accurate chemical solutions and it showed me it just wasn't a basic skill but a crucial skill which involved a high level of accuracy I also enjoyed conducting the experiment even though I encountered many errors I enjoyed finding a solution to them. I also think that this experiment has challenged me mentally in every academic way. It has also helped me to develop personal thinking strategies. During this experiment I learnt quote a lot and enhanced my general knowledge of chemicals as a whole and I learnt practical skills of preparing chemical solutions which I will be able to use in the future. Over all this experiment has been an interesting and an enlightening experience which I have gained many skills and much knowledge even though I had encountered many problems I enjoyed the experiment thoroughly and would gladly repeat it. ...read more.

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