Question

The concentration of citric acid, a triprotic acid, in a carbonated soft drink was to be determined. Step 1: A solution of NaOH(aq) was standardised by titrating it against 25.00 mL aliquots of a solution of the monoprotic acid potassium hydrogen phthalate (KHP). The KHP solution was produced by dissolving 4.989 g in enough water to make 100.0 mL of solution. The molar mass of KHP is 204.22 g mol$^{-1}$. The results of the standardisation titration are given in the table. Titration Volume NaOH (mL) 1 28.60 2 27.40 3 27.20 4 27.60 Step 2: A 75.00 mL bottle of the drink was opened and the contents quantitatively transferred to a beaker. The soft drink was gently heated to remove $CO_2$. This was done as any dissolved $CO_2$ adds to the acidity of a solution. Step 3: The cooled drink was quantitatively transferred to a 250.0 mL volumetric flask and distilled water was added up to the mark. Step 4: 25.00 mL samples of the solution were titrated with the NaOH(aq) solution. The average volume of NaOH(aq) used was 13.10 mL.

          The concentration of citric acid, a triprotic acid, in a carbonated soft drink was to be
determined.
Step 1:
A solution of NaOH(aq) was standardised by titrating it against 25.00 mL
aliquots of a solution of the monoprotic acid potassium hydrogen
phthalate (KHP). The KHP solution was produced by dissolving 4.989 g
in enough water to make 100.0 mL of solution. The molar mass of KHP is
204.22 g mol$^{-1}$.
The results of the standardisation titration are given in the table.
Titration	Volume NaOH (mL)
1	28.60
2	27.40
3	27.20
4	27.60
Step 2:
A 75.00 mL bottle of the drink was opened and the contents quantitatively
transferred to a beaker. The soft drink was gently heated to remove $CO_2$.
This was done as any dissolved $CO_2$ adds to the acidity of a solution.
Step 3: The cooled drink was quantitatively transferred to a 250.0 mL volumetric
flask and distilled water was added up to the mark.
Step 4: 25.00 mL samples of the solution were titrated with the NaOH(aq) solution.
The average volume of NaOH(aq) used was 13.10 mL.

The concentration of citric acid, a triprotic acid, in a carbonated soft drink was to be
determined.
Step 1:
A solution of NaOH(aq) was standardised by titrating it against 25.00 mL
aliquots of a solution of the monoprotic acid potassium hydrogen
phthalate (KHP). The KHP solution was produced by dissolving 4.989 g
in enough water to make 100.0 mL of solution. The molar mass of KHP is
204.22 g mol^-1.
The results of the standardisation titration are given in the table.
Titration Volume NaOH (mL)
1 28.60
2 27.40
3 27.20
4 27.60
Step 2:
A 75.00 mL bottle of the drink was opened and the contents quantitatively
transferred to a beaker. The soft drink was gently heated to remove CO2.
This was done as any dissolved CO2 adds to the acidity of a solution.
Step 3: The cooled drink was quantitatively transferred to a 250.0 mL volumetric
flask and distilled water was added up to the mark.
Step 4: 25.00 mL samples of the solution were titrated with the NaOH(aq) solution.
The average volume of NaOH(aq) used was 13.10 mL.

Added by James M.

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