Indicators change color depending on whether they are in a protonated (HIn) or unprotonated (In-) form. What is the equilibrium expression for the methyl orange indicator in water and what colors are the protonated and unprotonated forms of the indicator?

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13-02-2020
Chemistry

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Indicators change color depending on whether they are in a protonated (HIn) or unprotonated (In-) form. What is the equilibrium expression for the methyl orange indicator in water and what colors are the protonated and unprotonated forms of the indicator?

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pstnonsonjoku pstnonsonjoku · Answer 1 · 2020-02-17T04:52:21+01:00

Answer: The equilibrium expression for methyl orange is shown in the image attached. The colour in acid is red while the colour in base is yellow. At the neutral point, it has an orange colour

Explanation:

An indicator is an organic substance whose colour changes with changing hydrogen ion concentration. Because the colour changes with changing hydrogen ion concentration, it can be used to decide the end point of a neutralization reaction since it produces a colour change that signifies chemical equivalence. Methyl orange is normally used as indicator for strong acid weak base or strong acid strong base titration