CWV-35-COMP-phosphoric_acid - Computer Determining the...

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Computer35Chemistry with Vernier35 - 1Determining the Phosphoric AcidContent in Soft DrinksPhosphoric acid is one of several weak acids that exist in carbonated beverages. It is a componentof all cola soft drinks. Phosphoric acid has a much higher concentration than other acids in acontainer of soft drink, so its concentration can be determined by a simple acid-base titration.In this experiment, you will titrate a sample of a cola soft drink with sodium hydroxide solutionand determine the concentration of phosphoric acid, H3PO4. Hydrogen ions from the firstdissociation of phosphoric acid react with hydroxide ions from the NaOH in a one-to-one ratio inthe 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 of mostrapid pH change will then be used to determine the equivalence point. The volume of NaOHtitrant used at the equivalence point will be used to determine the molarity of the H3PO4.OBJECTIVESIn this experiment, you willUse a pH Sensor to monitor pH during the titration of phosphoric acid in a cola soft drink.Using the titration equivalence point, determine the molarity of H3PO4.MATERIALScomputer0.050 M NaOHVernier computer interfacevarious cola soft drinks, decarbonatedLoggerProdistilled waterVernier pH Sensorring stand50 mL buretutility clamp100 mL graduated cylindermagnetic stirrer (if available)

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Term
Summer
Professor
Heley
Tags
ml, Sodium hydroxide, pH sensor, Phosphoric acid

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