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Colour of phenolphthalein in acidic medi...

Colour of phenolphthalein in acidic medium

A

pink

B

yellow

C

colour less

D

orange

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Phenolphthalein**: - Phenolphthalein is a synthetic pH indicator commonly used in titrations and other chemical analyses. 2. **Behavior in Different pH Conditions**: - In acidic and neutral solutions, phenolphthalein remains colorless. - In basic solutions, phenolphthalein turns pink. 3. **Identifying the Medium**: - The question specifically asks about the color of phenolphthalein in an acidic medium. 4. **Conclusion**: - Since phenolphthalein is colorless in acidic conditions, the answer to the question is that phenolphthalein gives a colorless solution in acidic medium. ### Final Answer: - The color of phenolphthalein in acidic medium is **colorless**. ---
### Step-by-Step Solution: 1. **Understanding Phenolphthalein**: - Phenolphthalein is a synthetic pH indicator commonly used in titrations and other chemical analyses. 2. **Behavior in Different pH Conditions**: - In acidic and neutral solutions, phenolphthalein remains colorless. - In basic solutions, phenolphthalein turns pink. ...
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The pink colour of phenolphthalein in alkaline medium is due to

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The colour of phenolphthalein in acid is-

During the neutralisation of an acid by a base, the end point refers to the completion of reaction. The detection of end point in acid-base neutralisation is usually made by an acid-base indicator. An acid-base indicator is itself a weak acid (Phenolphthalein) or a weak base (Methyl orange). At 50% ionisation which depends on the medium. the anion furnished by an indicator (acid) cation furnished colour to solution at end point. For example, phenolphthalein dissociation underset("Colourless")(HIn)toH^(+)+underset("Pink")(In^(-)),K_(HIn)=([H^(+)][In^(-)])/([HIn]) is favoured in presence of alkali and pink colour of phenolphthalein ion is noticed as soon as the medium changes to alkali nature. The end point of acid-base neutralisation not necessarily coincides with eqivalence point but it is closer to equivalence point. Also at equivalence point of acid-base neutralisation, pH is not necessarily equal to 7. Which of the following statements are correct? (P) Phenolphthalein is not a good indicator for weak alkali titrations. (Q) Phenolphthalein does not give pink colour with weak alkalies as NH_(4)OH (R) Phenolphthalein is an basic indicator and imparts colour in basic medium.

During the neutralisation of an acid by a base, the end point refers to the completion of reaction. The detection of end point in acid-base neutralisation is usually made by an acid-base indicator. An acid-base indicator is itself a weak acid (Phenolphthalein) or a weak base (Methyl orange). At 50% ionisation which depends on the medium. the anion furnished by an indicator (acid) cation furnished colour to solution at end point. For example, phenolphthalein dissociation underset("Colourless")(HIn)toH^(+)+underset("Pink")(In^(-)),K_(HIn)=([H^(+)][In^(-)])/([HIn]) is favoured in presence of alkali and pink colour of phenolphthalein ion is noticed as soon as the medium changes to alkali nature. The end point of acid-base neutralisation not necessarily coincides with eqivalence point but it is closer to equivalence point. Also at equivalence point of acid-base neutralisation, pH is not necessarily equal to 7. The indicator phenolphthalein is a tautomeric mixture of two forms as given below: Which of the following statements are correct? The form II is referred as quinonoid form and is deeper is colour. (Q)The form I is referred as quinonoid form and is light in colour. (R) The form II is more stable in alkaline medium. (S) The change is pH from acidic to alkaline solution bring in the more and more conversion of I form to II form. (T) The form I is more stable in acidic medium.

During the neutralisation of an acid by a base, the end point refers to the completion of reaction. The detection of end point in acid-base neutralisation is usually made by an acid-base indicator. An acid-base indicator is itself a weak acid (Phenolphthalein) or a weak base (Methyl orange). At 50% ionisation which depends on the medium. the anion furnished by an indicator (acid) cation furnished colour to solution at end point. For example, phenolphthalein dissociation underset("Colourless")(HIn)toH^(+)+underset("Pink")(In^(-)),K_(HIn)=([H^(+)][In^(-)])/([HIn]) is favoured in presence of alkali and pink colour of phenolphthalein ion is noticed as soon as the medium changes to alkali nature. The end point of acid-base neutralisation not necessarily coincides with eqivalence point but it is closer to equivalence point. Also at equivalence point of acid-base neutralisation, pH is not necessarily equal to 7. Which among the followig statements are correct? (P) At equivalence point of NaOH AND HCI,pH=7 (Q) At equivalence point of NaOH and CH_(3)COOH,pH gt 7 (R) At equivalence point of NH_(4)OH and HCI,pH lt 7 (S) An indicator shows best results if equivalence point is within the pH range pK_(In)pm1 (T) ) At equivalence point of NH_(4)OH and formic acid pH lt 7

What is the colour of phenolphthalein in NaOH ?