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CHEM 213 GMU Dissociation of Acetic Acid and Bases Experiment Lab Report

CHEM 213 GMU Dissociation of Acetic Acid and Bases Experiment Lab Report

Question Description

Calculate and fill out the data tables with the information provided:

CH3COOH

Molarity of CH3COOH (M)

0.1020

Volume of CH3COOH (mL)

10.0

pH (First Reading)

Not given

pH (Second Reading)

Not given

Average pH

2.77

CH3COOH 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)

Ka

CH3COOH + NaOH

Molarity of NaOH (M)

0.0920

Volume of NaOH (mL)

4.0

pH (First Reading)

Not given

pH (Second Reading)

Not given

Average pH

4.28

CH3COOH 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)

Ka

Average Ka

% Error of Ka

Table 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

0.609

30.0

4.42

Na2HPO4 7H2O

0.608

30.0

8.45

Na3PO4 12H2O

0.224

10.0

11.96

12

Complete 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 HPO42- and PO43- solutions

■ Theoretical pH for H2PO4- and HPO42-

■ % Error for pH of H2PO4- and HPO42- and PO43-

Answer the following discussion questions and be specific:

■ Give a thorough interpretation of your results

■ Based on the today’s experiment describe a process toidentify an unknown, weak acid. How would you determinethe number of acidic groups present? What calculationsshould be done?

■ List possible sources of errors in both Parts A and B. Statehow each error would effect the calculated Ka (part A) andpH (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 tothe anticipated outcome?

■ Why or why not? What errors did you specifically experience inthis 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 onhow to perform calculations”, “instructor not explaining thelab procedure”, “do not make the class a distance-learningcourse”, etc. are NOT future improvements

LAB MANUAL (pg. 213-221)


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