The main constituents in vinegar are water and ethanoic acid (CH3COOH). In order to determine the concentration of acid in homemade vinegar, a student titrated 25 cm3 of 001 M NaOH against the vinegar. The equation for the reaction is: CH3COOH(aq) + NaOH(aq) ® CH3COONa(aq) + H2O(l) The following titration results were obtained: Burette readings (cm3) Rough 1 2 Final burette reading 20.10 38.90 31.40 Initial burette reading 0.10 20.00 12.50 Volume of vinegar used 20.00 18.90 18.90 (a) What volume of vinegar should be used in the calculation? (b) What is the mole ratio of NaOH:CH3COOH? (c) Calculate the number of moles of alkali in 25 cm3 of NaOH solution used.
- The main constituents in vinegar are water and ethanoic acid (CH3COOH). In order to determine the concentration of acid in homemade vinegar, a student titrated 25 cm3 of
001 M NaOH against the vinegar. The equation for the reaction is:
CH3COOH(aq) + NaOH(aq) ® CH3COONa(aq) + H2O(l)
The following titration results were obtained:
|
Burette readings (cm3) |
Rough |
1 |
2 |
|
Final burette reading |
20.10 |
38.90 |
31.40 |
|
Initial burette reading |
0.10 |
20.00 |
12.50 |
|
Volume of vinegar used |
20.00 |
18.90 |
18.90 |
(a) What volume of vinegar should be used in the calculation?
(b) What is the mole ratio of NaOH:CH3COOH?
(c) Calculate the number of moles of alkali in 25 cm3 of NaOH solution used.
(d) How many moles of acid were used in the titration?
(e) Calculate the molar concentration of the acid in vinegar.
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