The anthocyanin in hydrangeas can be isolated and used as an environmentally friendly pH indicator for...

The anthocyanin in hydrangeas can be isolated and used as an environmentally friendly pH indicator for titrations. At the end of a titration reaction of a strong acid with a strong base, you have a neutral solution. What color do you expect anthocyanin to be at the end of a titration? Describe a lab experiment to support your prediction.

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At the end of a titration reaction of a strong acid with a strong base, we have a neutral solution. At the end of a titration the color of anthocyanin will be purple.

Describe a lab experiment to support your prediction-

Titrations of 0.1 M NaOH and 0.1 M H₂SO₄ (strong acid-strong base titration),using Anthocyanins as a natural pH indicator.

A strong acid and strong base both ionizes completely in solution. Therefore, when a strong acid is combined with a strong base it produces a salt

H₂SO₄ (aq) +2 NaOH (aq) --------à Na₂SO₄ +2H₂O (l)

Since the Na₂SO₄ produced has no effect upon pH, when an equivalent amount of NaO H is added to a solution of H₂SO₄ the solution has a neutral pH (i.e. pH = 7.0)

This anthocyanin will be red at low pH value. It will be purple in neutral solution. It will be greenish-yellow if the solution is basic. We have to titrate until the color of the solution is purple.

queen_honey_blossom answered 1 year ago

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