Regents Chemistry Exam August 2024 Question 27
27 The indicator methyl orange is red in an aqueous solution that has a pH value of
(1) 9.2 (3) 4.5
(2) 7.0 (4) 2.7
Solution:
Table M on the Reference Table lists all of the indicators with their pH ranges. The pH rane for methyl orange is 3.1-4.4 and the colors go from red to orange. This means at the pH below 3.1, methyl orange is red and above 4.4 it is orange. Therefore choice 4 is the correct answer choice.
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