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Quantative Analysis of Acid in Vinegar

Acid content of vinegar
Flask 1 Flask 2

Inital volume of NaOH in burette 0 17.5

Final volume of NaOH in burette 17.5 35.3

Volume of NaOH used for titration 17.5 17.8

Average Volume of 0.50 M NaOH used 17.65ml

1 How to calculate the average number of moles of NaOH used?
2 How determine the molar concentration of acetic acid in vinegar, if
(xMl of NaOH added) (1L/1000ml)(0.5mole/L)
Molar Concentration of Acetic Acid =---------------------------------------------------
(10mL of vinegar used)(1L/1000mL)

3.How to calculate percent concentration of acetic acid in vinegar ,if
%(weight)=Mx60g/mole x 1L/1000mL x 100mL
M, molarity - 0.50 M NaOH
60g/mole if the formula wt. of acetic acid
note that 100mL of water is approximately equal to 100g of water

A) If two teaspoons of baking soda places in small zip lock bag and then places 50mL of vinegar in the bag and seals it. What would be expecting to see? What a chemical equation described in this experiment?

B) Baking soda is often added to the mixture called baking powder which is used in the baking of cakes and breads. Yeast is also used when making baked goods. When heated, the yeast reacts with the baking powder and releases a gas, CO2, which permeates through the bread and escapes from the surface of the bread. The process described is known as leavening. Why is this chemical reaction advantageous in the baking industry?

Solution Preview

1. Average Moles of NaOH:

(0.50 mol/L)(0.01765 L) = 0.008825 mol

2. Molarity of Acetic Acid:

Since the moles of NaOH must equal the moles of acetic acid, we can state that 0.008825 moles of acetic acid are in the flask.

How do we know this? Because of the following chemical reaction:

NaOH + CH3COOH ----> NaCH3COO + H2O

The two chemical species react in a ...

Solution Summary

Quantative Analysis of Acid in Vinegar is performed.