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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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What is Avogadro's number, and why is it useful? (3 points)
SashulF [63]

Answer:

6.022 x 10²³; it is a conversion factor between moles and number of particles

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4 0
4 years ago
Suppose you mix one mole of sulfuric acid (H2SO4) with 1 mole of sodium hydroxide(NaOH).
olasank [31]

Answer & Explanation:

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<em>H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O,</em>

It is clear that every 1.0 mol of H₂SO₄ needs 2 mol of NaOH to be neutralized completely.

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7 0
3 years ago
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frutty [35]

Answer:

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5 0
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