Phenolphthalein has a pka of 9.7 and is colorless in its acid form and pink in its basic form. for ph= 2.2 calculate [in−]/[hin].

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Solution:- If both acid and basic form are present at the same time then it's like a buffer solution since the buffer solution also has a weak acid and its conjugate base. The Handerson equation is used for solving buffer problems. Let's use the same equation here also.

The equation is:

pKa is given as 9.7 and the pH is 2.2. let's plug in the values in the equation.

subtract 9.7 from sides:

taking antilog:

So, the answer is  .

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