The 20-ml volume of water added to the erlenmeyer flask is to be previously boiled, deionized water. since water does absorb co2
1 answer:
The amount of acetic acid in vinegar is determined by the volumetric titration of acetic acid with standardized NaOH solution. When atmospheric carbon dioxide is absorbed by deionized water used in the titration, it would react with water and form carbonic acid.
When the deionized water is contaminated with carbonic acid, it would result in the consumption of a higher amount of NaOH for neutralization. Therefore, the amount of acetic acid determined would be too <u>high</u> than it should be.
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The chemical reaction is as follows:
Mass of reactant a is 1 g and molar mass is 94 g/mol. Converting mass into number of moles as follows:
Now, 1 mole of reactant a gives 1 mole of product d thus, 0.0106 mol of reactant a gives 0.0106 mol of product d.
Molar mass of product d is 125 g/mol, converting number of moles into mass as follows:
m=n×M=0.0106 mol×125 g/mol=1.33 g
Similarly, molar mass of reactant b is 118 g/mol and mass is 2 g, converting mass into number of moles,
1 mol of reactant b gives 1 mol of product d thus, 0.017 mol will give 0.017 mol of product d.
Converting number of moles into mass as follows:
m=n×M=0.017 mol×125 g/mol=2.12 g
Here, reactant that produces lesser product is limiting reactant and the amount of product it forms is theoretical yield.
Therefore, theoretical yield is 1.33 g.