객관식
Given the following data: Volume of HA used = 9.19 mL, Volume of NaOH at equivalence point = 8.42 mL, pH at equivalence point = 8.66, and Concentration of NaOH = 0.1471 M, what is the pKa of the acid HA?
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18. Aqueous Equilibrium
Acid-Base Indicators
객관식
Bromothymol blue is an acid-base indicator that changes color over a specific pH range. In which pH condition does bromothymol blue appear yellow?
A
Neutral solution (approximately )
B
Acidic solution (approximately )
C
Strongly basic solution only (approximately )
D
Basic solution (approximately )
검증된 단계별 안내1
Understand that bromothymol blue is an acid-base indicator that changes color depending on the pH of the solution it is in.
Recall that bromothymol blue typically changes from yellow to blue over a pH range of about 6.0 to 7.6, with yellow indicating acidic conditions and blue indicating basic conditions.
Identify that when the pH is less than approximately 6, the solution is acidic, and bromothymol blue appears yellow.
Recognize that at neutral pH (around 7), bromothymol blue appears greenish, as it is in the transition range between yellow and blue.
Conclude that bromothymol blue appears yellow in acidic solutions where the pH is less than about 6.
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