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Eva8 [605]
3 years ago
12

Phenolphthalein has a pka of 9.7 and is colorless in its acid form and pink in its basic form. part a for ph= 2.0 calculate [in−

]/[hin].
Chemistry
2 answers:
Tresset [83]3 years ago
8 0

Answer:

1.9953 × 10⁻⁸

Explanation:

Considering the Henderson- Hasselbalch equation for the calculation of the pH of the indicator as:

pH = pKa + log[In⁻]/[HIn]

Where Ka is the dissociation constant of the acid.

Given, pKa = 9.7

pH = 2.0

So,  

2.0 = 9.7 + log[In⁻]/[HIn]

log[In⁻]/[HIn]  = - 7.7

<u>[In⁻]/[HIn] = Antilog (-7.7) = 1.9953 × 10⁻⁸</u>

Karo-lina-s [1.5K]3 years ago
4 0
Use the h-h equation! 

pH = pKa + log[In-/HIn]
2.0 = 9.7 + log[In-/HIn]
-7.7 = log[In-/HIn]
10^-7.7 = [In-/HIn]
[In-/HIn] = 1.995 x 10^-8

Hope this helps!
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