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Acid Base Indicators

Q. Use the graph and the data for pH 4.60 below to determine the KIN of this indicator.

Solved • May 1, 2020

Acid Base Indicators

Q. 4) What is the colour of the indicator (phenolphthalein) in different pH?

Solved • May 1, 2020

Acid Base Indicators

Q. Which indicator would be the best to use for a titration between 0.10 M HCOOH with 0.10 M NaOH? You will probably need to consult the appropriate table in the book. Selected Answer: IncorrectD. alizarin yellow R, color change at pH 10-12 Correct Answer: CorrectA. phenolphthalein, color change at pH 8-10

Solved • Mar 24, 2020

Acid Base Indicators

Q. Alizarin yellow R, Ka = 7.9 x 10^-12, is yellow in its protonated from (HX) and red in its ionized form (X^-). At what pH will alizarin yellow R be a perfect orange color? Express your answer to one decimal place. What color would a alizarin yellow R solution be at pH = 13? a) yelow b) orange c) red

Solved • Mar 24, 2020

Acid Base Indicators

Q. Bromocresol purple is an indicator that changes color over a range from pH = 5.2 to pH = 6.8. What is Ka of bromocresol purple? Express your answer to one significant figure.

Solved • Mar 24, 2020

Acid Base Indicators

Q. Which indicator would be the best to use for a titration between 0.10 M HCOOH with 0.10 M NaOH? You will probably need to consult the appropriate table in the book.

Solved • Mar 23, 2020

Acid Base Indicators

Q. The acid form of an indicator is yellow and its anion is blue. The Ka of this indicator is 10^-5. What will be the approximate pH range over which this indicator changes color? a) 6 < pH < 8 b) 3 < pH < 5 c) 5 < pH < 7 d) 4 < pH < 6

Solved • Mar 12, 2020