Question: Color Plate 4 shows how the color of the acid-base indicator bromocresol green (H 2 BG) changes as NaCl is added to an aqueous solution

Color Plate 4 shows how the color of the acid-base indicator bromocresol green (H₂BG) changes as NaCl is added to an aqueous solution of (H⁺)(HBG^-). Explain why the color changes from pale green to pale blue as NaCl is added. Br Br Br Br + H* Br Br Br Br Add NaCI

Br Br Br Br + H* Br Br Br Br Add NaCI -SO BG (blue) HBG (yellow) H* counterion is not shown A counterion is the other ion in a solution needed for charge neutrality

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