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Calculate and fill out the data tables with the information provided:CH3COOHMolarity of CH3COOH (M)0.1020Volume of CH3COOH (mL)10.0pH (First Reading)Not givenpH (Second Reading)Not givenAverage pH2.77CH3COOH initially present (moles)Concentration of H+ @ Equilibrium (M)H+ present @ Equilibrium (moles)CH3COO- present @ Equilibrium (moles)Concentration of CH3COO- @ Equilibrium (M)CH3COOH present @ Equilibrium (moles)Concentration CH3COOH @ Equilibrium (M)KaCH3COOH + NaOHMolarity of NaOH (M)0.0920Volume of NaOH (mL)4.0pH (First Reading)Not givenpH (Second Reading)Not givenAverage pH4.28CH3COOH initially present (moles)CH3COOinitially present (moles)NaOH present @ Equilibrium (moles)Concentration NaOH @ Equilibrium (M)CH3COOH present @ Equilibrium (moles)Concentration CH3COOH @ Equilibrium (M)CH3COO- present @ Equilibrium (moles)Concentration of CH3COO- @ Equilibrium (M)Concentration of H+ @ Equilibrium (M)KaAverage Ka% Error of KaTable 2. Raw, Processed, and Theoretical Data for the Determination of the Dissociation Constant of Phosphoric Acid Mass of Sample Volume H2O Concentration Solution Experimental pH Theoretical pH (g)(mL)(M) NaH2PO4 0.60930.04.42Na2HPO4 ●7H2O 0.60830.08.45Na3PO4 ●12H2O 0.22410.011.9612Complete the calculations with the information from the data table and show work: – Acetic Acid ■ Hydrogen ion concentration
■ Ka ■ % Error – Acetic Acid + NaOH ■ Equilibrium molarity of CH3COOH and CH3COO- ■ Hydrogen ion concentration ■ Ka – Phosphate Salts ■ Concentration of H2PO4
– and HPO4
2- and PO4
3- solutions ■ Theoretical pH for H2PO4
– and HPO4
2- ■ % Error for pH of H2PO4
– and HPO4
2- and PO4
3-Answer the following discussion questions and be specific:■ Give a thorough interpretation of your results ■ Based on the today’s experiment describe a process to
identify an unknown, weak acid. How would you determine
the number of acidic groups present? What calculations
should be done? ■ List possible sources of errors in both Parts A and B. State
how each error would effect the calculated Ka (part A) and
pH (part B) values.Write a conclusion paragraph: ■ Restate the purpose of the experiment ■ How did you attempt to meet the purpose? ■ Was the purpose met? ■ Restate the anticipated outcome. Was the actual outcome close to
the anticipated outcome? ■ Why or why not? What errors did you specifically experience in
this experiment?
– Distance-learning format of the class is not an error ■ What are some future improvements to this experiment?
– “Updating the lab manual”, “clear/better instructions on
how to perform calculations”, “instructor not explaining the
lab procedure”, “do not make the class a distance-learning
course”, etc. are NOT future improvementsLAB MANUAL (pg. 213-221)


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