The following graphs each show two titration curves; one is the titration of a s
ID: 1033306 • Letter: T
Question
The following graphs each show two titration curves; one is the titration of a strong acid with a strong base, and one is the titration curve of a weak acid with a strong base. Each graph shows where the stated indicator changes color.
Which indicator would be appropriate to use for the STRONG acid titration?
SELECT ALL CORRECT ANSWERS!! YOU MAY MAKE MORE THAN ONE ANSWER CHOICE!
A. Methyl red indicator
B. Phenolphthalein indicator
Methyl red 14 13 12 10 equrvalence points. 6haff-equivalence 5? .. point. 0 5 10 15 20 25 30 35 44 50 Volume of 0.1 M NaOH added (mL)Explanation / Answer
Answer:
Both indicators can be used for it
As for a strong acid-strong base titration, the equivalence point is at pH 7. The pH range of phenolphthalein is about 7 -9.0, but the titration curve is so steep at the equivalence point that phenolphthalein acts a good indicator.
For a strong acid-weak base titration, the equivalence point is probably near pH 5. Here as we see from the given graphs we could use an indicator like methyl red (pH 4.4 to 6.2).
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