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n200080 [17]
3 years ago
8

Bromocresol green, Ka=2.0×10−5, is yellow in its protonated form (HX) and blue in its ionized form (X−). At what pH will bromocr

esol green be a perfect green color?
Chemistry
1 answer:
nydimaria [60]3 years ago
4 0

Answer:

pH = 4,70

Explanation:

For bromocresol, as HX is yellow and X⁻ is blue, the indicator will be a perfect green color when HX = X⁻.

Using Henderson-Hasselbalch formula:

pH = pka + log [X⁻]/[HX] <em>(1)</em>

Where pka is -log ka = -log2,0x10⁻⁵ = 4,70

As HX = X⁻, [HX] / [X⁻] = 1

Replacing in (1):

pH = 4,70 + log 1

pH = 4,70 + 0

<em>pH = 4,70</em>

<em></em>

I hope it helps!

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Now put all the given values in the above expression, we get:

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