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Titration of commercial products

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Introduction

Lab Report #1: Titration of commercial products Experiment #1: Aim: To determine the concentration of acetic acid in vinegar. Variables: Independent: Volume/Amount of NaOH Dependent: Volume/Amount of acetic acid produced (CH3COOH) Controlled: Molarity of CH3COOH, Molarity of NaOH, pressure (not controlled, assumed), Temperature Materials: Check photocopy. Diagram: Procedure: Check photocopy. Data Collection: Results for vinegar: Group 1 Group 2 Group 3 Group 4 Volume of Vinegar (cm3 � 0.1) 5.0 5.0 5.0 5.0 Volume of NaOH (1 mol dm-3). Trial #1 (cm3 � 0.1) 3.9 4.9 6.3 4.0 Volume of NaOH (1 mol dm-3). Trial #2 (cm3 � 0.1) 3.7 5.0 6.6 4.3 Average of volumes of NaOH (1 mol dm-3 � 0.1) (cm3 � 0.1) 3.8 4.95 6.45 4.15 Data Processing: The equation for the reaction of titration of acetic acid is the following: CH3COOH (aq) + NaOH (aq) ...read more.

Middle

Errors & Improvements: - No precise way to judge when the titration ends (with naked eye) - Similar but not identical way of rinsing for the burette. - Inaccurate way of measuring the volume of NaOH used. - Rinsing provided by one subject - More reverse titration applied - Repeat experiment to deduce an average Conclusion: The value for the average amount of the acetic acid produced is 5.94g (~5.9g � 0.1) per 100ml of vinegar, and therefore complies with the federal requirement of a minimum of 4g of acetic acid per 100ml of vinegar. Experiment #2: Aim: To determine the amount (as a percentage) of magnesium hydroxide in the milk of magnesia tablets. Variables: Independent: Volume/Amount of Hydrochloric acid - HCL Dependent: Concentration of Mg(OH)2 found in the magnesia tablets Controlled: Molarity and amount of HCl, Molarity and amount of NaOH, pressure (not controlled, assumed), Temperature Materials: Check photocopy. ...read more.

Conclusion

of 0.008mol of Mg(OH)2 was used, that is, 2HCl --> 1 Mg(OH)2 0.015mol / 2 = 0.008mol 0.008mol x 58g mol-1 = 0.46g And as there is 0.46g of Mg(OH)2 / 4.83 of milk of magnesia, an approximate 9.5% (~10%) of milk of magnesia tablets are composed by Mg(OH)2 . Errors & Improvements: - No precise way to judge when the titration ends (with naked eye) - Similar but not identical way of rinsing for the burette. - Inaccurate way of measuring the mass of Milk of Magnesia - Not persistent stirring provided in order to dilute the Mg(OH)2 - Rinsing provided by one subject - More reverse titration applied - Repeat experiment to deduce an average Conclusion: The experiment showed that an approximate 10% of the milk of magnesia tablets are made of Magnesium hydroxide (Mg(OH)2). It also showed that the value is close to the one established by Phillips, which is 8g/100ml. ?? ?? ?? ?? 1 ...read more.

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