A scientist wants to test how much of an acid can be added to a solution before the pH of the solution changes to below a certain point. The starting pH of the solution is 6.0, and the scientist wants to know when the pH of the solution changes to below 5.0. Which pH indicator should the scientist use? A.Phenolphthalein, which changes from colorless to purple around a pH of 8.3 B.Cresol red, which changes from yellow to purple around a pH of 7.2 C.Congo red, which changes from red to violet around a pH of 5.0 D.thymolphthalein, which changes from colorless to blue around a pH

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A scientist wants to test how much of an acid can be added to a solution before the pH of the solution changes to below a certain point. The starting pH of the solution is 6.0, and the scientist wants to know when the pH of the solution changes to below 5.0. Which pH indicator should the scientist use? A.Phenolphthalein, which changes from colorless to purple around a pH of 8.3 B.Cresol red, which changes from yellow to purple around a pH of 7.2 C.Congo red, which changes from red to violet around a pH of 5.0 D.thymolphthalein, which changes from colorless to blue around a pH

Biology
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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Which do you believe it is?
c

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I believe that is correct; double checking
k
Congo red is the sodium salt of 3,3'-bis. It is a secondary diazo dye. Congo red is water soluble, yielding a red colloidal solution; its solubility is better in organic solvents such as ethanol.
so c
Not sure but think so yes
makes sense
the clue is in the option congo red changes to to violet at 5 pH so that is your indicator at that pH level

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