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Three solutions of Triblu indicator, all of equal concentration, were made at pH 1, pH 6...

Three solutions of Triblu indicator, all of equal concentration, were made at pH 1, pH 6 and pH 10. The pH 1 solution had an absorbance at 620 nm of 0.378, while the pH 10 solution had an absorbance of 0.545. If Triblu indicator has a pKa of 5.0, what would the absorbance of the pH 6 solution be at 620 nm? Answer to three decimal places.

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Answer #1

1. The universal indicator is not a single chemical compound,but a mixture of all the mentioned indicators. At pH it will begreen or greenish blue in color as indicated by the color in range6.2 to 7.6.

At pH 1.2 it will be red. Hence, option B is correct.

2. Since there is no indicator for the range of 7.6 to 8.0, theindicator will be unable to disti8distithis range. Option A iscorrect.

3. NaCl(s) Na+(aq) +Cl-(aq) Option A and B are correct.

4. CaCl2(s) Ca2+(aq) +2Cl-(aq) Option C and D are correct.

5. CH3COONa(aq) CH3COO-+ Na+ Option C and D are correct.

6. Na2CO3 2Na+ +CO3 2- Option A and B are correct.

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