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Homework answers / question archive / Acid content of vinegar Flask 1 Flask 2 Inital volume of NaOH in burette 0 17

Acid content of vinegar Flask 1 Flask 2 Inital volume of NaOH in burette 0 17

Chemistry

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?

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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 1:1 molar ratio.

Therefore, according to your information, you used 10 ml of vinegar.

Therefore,

0.008825 mol/0.010 L = 0.8825 M

3. Percentage of Acetic Acid in Vinegar

The molar mass of acetic acid is 60.0 g/mol. Therefore, first, we can calculate grams of acetic acid per litre of vinegar.

(60 g/mol)(0.8825 mol/L) = 52.96 g/L

This is equivalent to 5.296 g/100 mL. Therefore, the % weight is approximately 5.3.

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Baking soda is sodium bicarbonate, NaHCO3. Vinegar contains acetic acid, CH3COOH.

Therefore, the reaction is:

NaHCO3 + CH3COOH ----> NaCH3COO + H2CO3

But then, the H2CO3 (carbonic acid) decomposes like this:

H2CO3 ----> H2O + CO2(g)

Therefore, we will see CO2 (carbon dioxide) gas bubble out of solution.

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CO2 produced in baking products causes the bread to puff up. Otherwise, all bread would be flat and heavy. The CO2 released by the yeast makes the bread airy and light -- much tastier for most people.
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