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Acid-Base Titration Curves
INSTRUCTOR RESOURCES
The CCLI Initiative
Learning Objectives to understand the titration curves for the following solutions • a weak acid: acetic acid, CH3COOH. • • • • • a strong acid: hydrochloric acid, HCl. an acidic commercial cleanser. a basic commercial cleanser. to use the titration curves to calculate the percent of the active ingredients in the commercial cleansers. to determine the Ka of a weak acid. Procedure Overview • • • • after calibration of the pH electrode and determination of the flow rate for the automatic titration, a NaOH solution is standardized against HCl. a pH titration curve for acetic acid is obtained and its pKa is determined. an unknown sample of Lysol is analyzed for its HCl content using the standardized NaOH. an unknown sample of Liquid Plumr is analyzed for its NaOH and NaOCl content using HCl of known molarity.
7
Name ______________________________ Section _______
Date ____________________
ACID-BASE TITRATION CURVES Report Sheet Determination of flow rate Equation for conversion from time to volume: Titration of HCl pH at equivalence point volume of NaOH at equivalence point concentration of HCl volume of HCl Titration of acetic acid pH at equivalence point volume of NaOH at equivalence point volume at half-equivalence point pH at half-equivalence point Titration of Lysol weight of beaker with Lysol weight of empty beaker mass of Lysol pH at equivalence point volume of NaOH at equivalence point Titration of Liquid Plumr weight of beaker with Liquid Plumr weight of empty beaker mass of Liquid Plumr pH at first equivalence point volume of HCl at first equivalence point pH at second equivalence point volume of HCl at second equivalence point
8
Name ______________________________ Section _______
Date ____________________
ACID-BASE TITRATION CURVES Report Sheet Calculations 1. Titration of HCl (Standardization of NaOH) a. Determine the moles of HCl.
b. Calculate the
INSTRUCTOR RESOURCES
The CCLI Initiative
Learning Objectives to understand the titration curves for the following solutions • a weak acid: acetic acid, CH3COOH. • • • • • a strong acid: hydrochloric acid, HCl. an acidic commercial cleanser. a basic commercial cleanser. to use the titration curves to calculate the percent of the active ingredients in the commercial cleansers. to determine the Ka of a weak acid. Procedure Overview • • • • after calibration of the pH electrode and determination of the flow rate for the automatic titration, a NaOH solution is standardized against HCl. a pH titration curve for acetic acid is obtained and its pKa is determined. an unknown sample of Lysol is analyzed for its HCl content using the standardized NaOH. an unknown sample of Liquid Plumr is analyzed for its NaOH and NaOCl content using HCl of known molarity.
7
Name ______________________________ Section _______
Date ____________________
ACID-BASE TITRATION CURVES Report Sheet Determination of flow rate Equation for conversion from time to volume: Titration of HCl pH at equivalence point volume of NaOH at equivalence point concentration of HCl volume of HCl Titration of acetic acid pH at equivalence point volume of NaOH at equivalence point volume at half-equivalence point pH at half-equivalence point Titration of Lysol weight of beaker with Lysol weight of empty beaker mass of Lysol pH at equivalence point volume of NaOH at equivalence point Titration of Liquid Plumr weight of beaker with Liquid Plumr weight of empty beaker mass of Liquid Plumr pH at first equivalence point volume of HCl at first equivalence point pH at second equivalence point volume of HCl at second equivalence point
8
Name ______________________________ Section _______
Date ____________________
ACID-BASE TITRATION CURVES Report Sheet Calculations 1. Titration of HCl (Standardization of NaOH) a. Determine the moles of HCl.
b. Calculate the