Table of Contents
Is phenolphthalein a strong base?
A strong acid- strong base titration is performed using a phenolphthalein indicator. Phenolphtalein is chosen because it changes color in a pH range between 8.3 – 10. It will appear pink in basic solutions and clear in acidic solutions.
Why is phenolphthalein an acid?
Because it indicates the pH of the solution, it is colourless below 8.5 pH and is able to attain a pink to deep red colour above 9.0 pH. Phenolphthalein is a weak acid and it dissociates in water to give pink anions. Hence, we can say that phenolphthalein is a weak acid. Therefore, (B) is the correct answer.
What color is phenolphthalein in acidic conditions?
Colourless
Other indicators
| Indicator | Acidic | Alkaline |
|---|---|---|
| Methyl orange | Red | Yellow |
| Phenolphthalein | Colourless | Pink |
What color is phenolphthalein in a base?
Phenolphthalein is an indicator — a chemical which changes colour depending on whether it meets an acid or a base. It turns purple if it meets something basic, such as ammonia; it stays colourless if it meets an acid like vinegar or a neutral substance like water.
What is the pH of phenolphthalein?
phenolphthalein, (C20H14O4), an organic compound of the phthalein family that is widely employed as an acid-base indicator. As an indicator of a solution’s pH, phenolphthalein is colourless below pH 8.5 and attains a pink to deep red hue above pH 9.0.
Is methyl orange basic or acidic?
Methyl Orange is a weak acid which dissociates in water forming orange neutral molecules.
Why phenolphthalein is pink in basic medium?
Complete step by step solution: -Phenolphthalein is widely used as an indicator in acid-base titrations. -It turns colourless in presence of an acid and turns pink in presence of a base. It is due to the formation of ions that the solution turns pink.
Why does phenolphthalein give pink in basic medium?
Phenolphthalein solution turns pink in the presence of a base. This is because the hydroxide ions react with the acidic group present and lead to the formation of ions. These ions impart color to the solution. This is how phenolphthalein solution acts as an acid-base indicator in titrations.
How does phenolphthalein behave in acidic and basic medium?
Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. It is a weak acid, which can lose H+ ions in solution.
Why phenolphthalein is Colourless in acidic medium?
Does phenolphthalein turn pink in acid or base?
Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions.
Is phenolphthalein pink in acid?