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Titrations. For my science coursework I have been asked to carry out an experiment to investigate the strengths of different sodium hydroxide solutions. By the end of my experiment I would like to find out which solution would be the best antacid to overc

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Science Coursework Titrations Introduction: For my science coursework I have been asked to carry out an experiment to investigate the strengths of different sodium hydroxide solutions. By the end of my experiment I would like to find out which solution would be the best antacid to overcome indigestion. Indigestion is when acid from your stomach flows back up the oesophagus. I will be testing three sodium hydroxide (Na) solutions which have varying strengths, they are labelled A, B and C. To investigate the strength of each alkali I will use 4 different methods to measure the solutions. Phenolphthalein indicator is added to the antacid to turn it pink. Acid is added to the alkali solution to neutralise it. The amount of Acid which is added to each solution will determine the strength ness of it. Neutralisation is an irreversible chemical reaction; this is when an acid is neutralised by an alkali. This kind of chemical reaction produces reactants which are water and salt. The formula for this is: Acid + Alkali --> Salt + Water. The equation for this experiment will be: Hydrochloric Acid + Sodium Hydroxide HCl (aq) +NaOH (aq) --> NaCl (aq) +H2O (l) Apparatus: 1 x 250cm3 Beaker, 1 x 200cm3 Beaker, Pipette Filler, Pipette, Conical Flask, Clamp, Clamp stand, Test tube, Test tube stand, Burette, Measuring cylinder. Sodium Hydroxide solutions A, B and C, Hydrochloric Acid, Phenolphthalein (Indicator), Water. ...read more.


Then place it on the tile, under the burette. 8. Open the tap to allow the acid to flow into the conical flask. As soon as the solution turns colourless turn the tap so no more acid can fall into the solution (this will make the experiment more reliable and accurate). 9. Record the final burette reading. 10. Subtract the starting burette reading amount from the final burette reading to find out how much acid was required to neutralise the solution. Record this result. 11. Rinse out the conical flask, and repeat the same experiment another 3 times as the first one is just a rough titration. 12. After all titrations are done for one sodium hydroxide solution, clean all equipment thoroughly with water. 13. Repeat the experiment 4 times for the remaining Sodium Hydroxide solutions (B and C) During this experiment I had to read a burette twice (at step 6 and step 9), reading a burette can be quite difficult. This is the right way to read it- A meniscus is curve that is at the surface of the acid when is formed when it is in a burette. The volume is read at the bottom of the meniscus. You always read the burette where the bottom of the meniscus is. For example- It is important to record the results accurately in order to get factual results. ...read more.


of a liquid. A typical pH meter consists of a special measuring probe (a glass electrode) connected to an electronic meter that measures and displays the pH reading. This would have given me more accurate readings. However I think titrations was the best strategy out of all the methods I had tried. It was extremely accurate and only little mistakes could be made. Although I did find a few outliers during my experiment. The biggest outlier I found was the first titration of the whole expermint which was a rough one, the result outcome was 24.30cm whereas the other results were between 25.00-26.00. This may be because the equipment weren't cleaned put properly or the results weren't read accurately. To make my results even more accurate I could have redone them, however with such a small difference I did not feel that it was not necessary. If I wanted to have strong results I could repeat these experiments where there would not be any outliers whatsoever. In conclusion, I think I chose the finest method to find out which antacid is the best solution to cure indigestion according to the equipment which was available. I tested other strategies and came to a conclusion that they weren't accurate enough. Using a burette and pipette, secured my results and made them extremely reliable. My experiment was carried out carefully and precisely in order to get a fair result. Overall I believe my experiment was triumphant, and by the end of it I found out which antacid successfully combats indigestion. ?? ?? ?? ?? - 1 - ...read more.

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