SDeterminationofPhosphoricAcidContentinSoftDrinks -...

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DETERMINATION OF PHOSPHORIC ACID CONTENT INSOFT DRINKSLAB PH 8FromChemistry with Calculators, Vernier Software & Technology, 2000INTRODUCTIONPhosphoric acid is one of several weak acids that present in carbonated beverages. It is acomponent of all cola soft drinks. Phosphoric acid has a much higher concentration thanother acids present in a soft drink, so its concentration can be determined by a simpleacid-base titration.In this experiment, you will titrate a sample of a cola soft drink with a sodium hydroxidesolution and determine the concentration of phosphoric acid, H3PO4. Hydrogen ions fromthe first dissociation of phosphoric acid react with hydroxide ions from the NaOH in aone-to-one ratio in the overall reaction:H3PO4(aq) + OH(aq)⎯ →H2O(l) + H2PO4(aq)In this experiment, you will use a pH Sensor to monitor pH as you titrate. The region ofmost rapid pH change will then be used to determine the equivalence point. The volumeof NaOH titrant required to reach the equivalence point will be used to determine themolarity of the H3PO4.PURPOSEThe purpose of this experiment is to determine the amount of phosphoric acid,H3PO4, in avariety of soft drinks by titrating each sample with sodium hydroxide, NaOH.MATERIALSLabPro interface50-mL buretTI Graphing Calculator100-mL graduated cylinderDataMate program250-mL beakerpH Sensorring standvarious cola soft drinks, decarbonatedutility clamp0.050 M NaOHmagnetic stirrer (if available)deionized waterstirring bar ( or stirring rod)SAFETY

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Term
Summer
Professor
NoProfessor
Tags
Chemistry, pH, Sodium hydroxide, pH sensor, phosphoric acid content

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