Make a rough sketch of the titration curve for the titration of Na₂CO3 with HCl. Plot pH on the y axis and volume of HCl on the x axis. Suppose that both phenolphthalein and bromcresol green are present in the titration solution. State what colors you would expect to observe at the following points: a) before the first end point, b) at the first end point, and c) at the second end point.
Make a rough sketch of the titration curve for the titration of Na₂CO3 with HCl. Plot pH on the y axis and volume of HCl on the x axis. Suppose that both phenolphthalein and bromcresol green are present in the titration solution. State what colors you would expect to observe at the following points: a) before the first end point, b) at the first end point, and c) at the second end point.
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:Make a rough sketch of the titration curve for the titration of Na₂CO3 with HCl. Plot pH
on the y axis and volume of HCl on the x axis. Suppose that both phenolphthalein and
bromcresol green are present in the titration solution. State what colors you would expect
to observe at the following points: a) before the first end point, b) at the first end point,
and c) at the second end point.
Expert Solution
Step 1
Na2CO3 or CO32-(aq) is a diacidic base with pKa values 6.37 and 10.32.
Hence there will be two equivalence points.
The neutralization reactions are:
CO32-(aq) + H+(aq) HCO3-(aq) (1st equivalence point near pH = 8 and indicated by phenolphthalein indicator)
HCO3-(aq) + H+(aq) H2CO3(aq) (2nd equivalence point near pH = 3.6 and indicated by bromocresol green)
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