A certain colorless solution has a pH of 2.3. If we add phenolphthalein indicato

Question

A certain colorless solution has a pH of 2.3. If we add phenolphthalein indicator to this solution, what will be the color of the resulting solution? Now, suppose we add an base drop-wise to the solution from (i). what will we observe as we continue to add the base? The pH of a certain solution is 6.0. What color would the indicators methyl violet, methyl orange, and phenolphthalein be in this solution? Methyl violet ______ Methyl orange _____ Phenolphthalein ________ Methyl violet is violet in a given solution. Methyl orange is red in the same solution. What is the approximate pH of the solution? Briefly explain.

Explanation / Answer

Q3

i)

adding phenolphtalein, an basic indicator, will NOT change the color of solution, since pH > 8 in order to change color

ii)

if we add bases, then we will see some pink solutino due to the hig hOH- concentration

b)

pH = 6

methyl violet range (1-2) --> this will turn to purple due to high pH

methyl orange range --> turns yellow when pH 4, so this will be yellow

phenolphtalein range --> remains transparent

c)

pH must be between ranges

pH max / pH min:

2 - 3.1

approx

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