Lab 5 Formal.docx - Lab 5: pH- Titration Name: Efe Sobotie...

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Lab 5: pH- TitrationName: Efe SobotiePartner’s Name: Maggie GrahamLab Time: Thursday 2:00-4:45Section: 1008-004TA: Treva Brown
AbstractThe goal of this experiment was to use the known concentration of NaOH, which was 0.1M, to determine the concentration of HCl and an unknown acid. The method that was used todetermine these concentrations is titration. The main results of the experiment were determiningthe equivalence points, finding the concentrations, and creating a titration curve.IntroductionTitration is the process of determining the concentration of an unknown acid or base byusing the concentration of a known acid or base. In this experiment, the acids to be determinedare an unknown acid and HCl, while the known base is NaOH. The two types of acids whoseconcentrations were determined were a weak acid and a strong acid. HCl is a strong acid, whichmeans that if fully ionizes in solution.1A neutralization reaction occurs when HCl is titrated withNaOH which is2:HCl(aq) + NaOH(aq) → NaCl(aq) + H2OThe unknown acid was a weak acid, meaning that it does not fully ionize in a solution.1Aneutralization reaction also occurs with the weak unknown acid which is2:HA(aq) + NaOH(aq) → NaA(aq) + H2OThe equivalence point is important because it is where the, “equivalent amount of titrant hasbeen added to the sample”.3The indicator is used as a visual sign of the color change.3Phenolphthalein was used in the experiment. The end and equivalence point are very close innumber.3The equivalence point for the weak acid and strong base was at an alkaline pH.3Theequivalence point for HCl and NaOH should be 7, or around 7, because they are both strong intheir respective acids and bases; and 7 is the neutral pH. The equivalence points are used to findthe concentrations of the acids. Equation 1 was used to determine the concentration of the HCl.Equation 2 is used to determine the concentration by using the pH of the experiment.Equation 1: CbaseVbase=moles of base = moles of acidEquation 2: [H+] = 10¯pHExperimentalThis experiment had three different parts. A pH meter, NaOH, an unknown acid, HCl, Coca-Cola, a burette, a volumetric pipet, a pipet pump, a stir plate, a magnetic stir bar, a rod, a large clamp, a small clamp, a titration apparatus, a beaker, a 250-mL Erlenmeyer flask, an 

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Term
Fall
Professor
Pheobe Zito

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