Problem: A 0.552-g sample of ascorbic acid (vitamin C) was dissolved in water to a total volume of 20.0 mL and titrated with 0.1103 M KOH, and the equivalence point occurred at 28.42 mL. The pH of the solution at 10.0 mL of added base was 3.72.Pick a suitable indicator for this titration.

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A 0.552-g sample of ascorbic acid (vitamin C) was dissolved in water to a total volume of 20.0 mL and titrated with 0.1103 M KOH, and the equivalence point occurred at 28.42 mL. The pH of the solution at 10.0 mL of added base was 3.72.
A table showing the ranges of color changes for several acid-base indicators. Crystal Violet: yellow at 0 to blue at 2. Thymol Blue: red at 1 to yellow at 3 and yellow at 8 to blue at 9. Erythrosin B: red at 2 to orange at 3 point 5. 2,4-Dinitrophenol: red at 2.5 to orange at 4. Bromphenol Blue: yellow at 3 to blue at 4 point 5. Bromocresol Green: yellow at 4 to blue at 5 point 5. Methyl Red: red at 4 to yellow at 6. Eriochrome Black T: red at 5 to blue at 6 point 5. Bromocresol Purple: yellow at 5 to purple at 6 point 5. Alizarin: yellow at 5.5 to red at 7 and red at 11 to purple at 12. Bromthymol Blue: yellow at 6 to blue at 7 point 5. Phenol Red: yellow at 7 to red at 8. m-Nitrophenol: red at 7 to orange at 8 point 5. o-Cresolphthalein: colorless at 8.5 to red at 10. Phenolphthalein: colorless at 8.5 to pink at 10. Thymolphthalein: colorless at 9.5 to blue at 10 point 5. Alizarin yellow R: yellow at 10 to red at 12.
Pick a suitable indicator for this titration.

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