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ANALYTICAL CHEMISTRYEXPERIMENT 3:NEUTRALISATION CAPACITY OF COMMERCIAL ANTACID TABLET
ABSTRACTThis experiment is to determine theneutralisation capacity of commercial antacidtablet.Firstly, dissolve the tablet in an excess amount of acid of known concentration. Someof the HCl will be neutralized by the carbonate, but there will be some remaining. Continuewith a titration with NaOH solution from experiment 2 to figure out the amount of excessacid. Then, from this, calculate how much acid reacted with the antacid. This method ofanalysis is called a back-titration. The reactions above are reversible, which means that CO2dissolved in water will produce some carbonic acid. This acid will react with the NaOHsolution and the titrating and give us inaccurate results. Therefore it is important to boil thesolution when the carbonate reacts with acid, to remove CO2 as a gas.OBJECTIVE1.To prepare Hydrochloric Acid Solution.2.To standardise the Acid against Sodium Hydroxide.3.To determine Neutralisation Capacity of a Commercial Antacid Tablet.INTRODUCTIONThis experiment is about neutralisation capacity of commercial antacid tablet. Firstly,preparing an approximate concentration of hydrochloric acid solution and standardise againststandard sodium hydroxide solution from experiment 2. Hydrochloric acid is also not aprimary standard because its concentrated solution vaporises rapidly at room temperature.Once the accurate molarity of the hydrochloric acid solution is known, t is referred asstandard solution.