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Sphinxa [80]
3 years ago
8

Solution A is yellow when alizarin yellow is added and blue when thymol

Chemistry
1 answer:
olga2289 [7]3 years ago
4 0

Answer:

D. 6.3 x 10-5 mol/L NaOH

Explanation:

Alizarin yellow is an indicator that is yellow when pH < 10.1. In the same way, thymol blue is blue when pH > 9

That means the pH of the solution is between 9 - 10.1

Any acid as HCl could have a pH of these.

The solution of 3.2x10⁻⁴M NaOH has a pH of:

pOH = -log[OH-] = 3.49

pH = 14-pOH = 10.51. The pH of the solution is not 10.5

Now, the solution of 6.3x10⁻⁵M NaOH has a pH:

pOH = -log[OH-] = 4.2

pH = 14-pOH = 9.8

The pH of the solution could be 9.8. Right option is:

<h3>D. 6.3 x 10-5 mol/L NaOH</h3>
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The closest answer from the options would be option D.

I hope this helps.

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