Table of Contents
- 1 What is the functional group in phenolphthalein?
- 2 What is the reaction involved in the formation of phenolphthalein?
- 3 What is the reaction of soap alcohol solution with phenolphthalein?
- 4 What type of substance is phenolphthalein?
- 5 What is reaction of acid with phenolphthalein?
- 6 What is the reaction of base with phenolphthalein answer?
- 7 What is the effect of phenolphthalein in soap solution?
- 8 What kind of colour change occurs in phenolphthalein solution on the addition of potassium hydroxide?
- 9 What happens when Phenolphthalein is ionized?
- 10 Why does phenolphthalein turn pink in an alkaline solution?
What is the functional group in phenolphthalein?
The structure of Phenolphthalein has 3 hexagonal structures, one pentagonal structure, 2 alcoholic groups, and one ketone group. Besides, Phenolphthalein structure form of the carbon, hydrogen, and oxygen chains.
What is the reaction involved in the formation of phenolphthalein?
Phenolphthalein can be synthesized by condensation of phthalic anhydride with two equivalents of phenol under acidic conditions. It was discovered in 1871 by Adolf von Baeyer.
What is the function of phenolphthalein in the experiment?
Why is phenolphthalein used in the experiment? Phenolphthalein is used as indicator for titrations for titrations. Phenolphthalein is an example of weak acid. Phenolphthalein is used because it changes colour close to pH 7, the pH of the equivalence point of a strong acid with a strong base.
What is the reaction of soap alcohol solution with phenolphthalein?
Soap solution is a base, so when phenolphthalein is added to it, it will turn pink.
What type of substance is phenolphthalein?
acid-base indicator
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.
Why does phenolphthalein change Colour in different mediums?
Ionized molecules attract other molecules with the opposite charge and repel those with the same charge. Phenolphthalein is a weak acid and is colorless in solution although its ion is pink. Adding hydroxide ions (OH-, as found in bases) will change the phenolphthalein into its ion and turn the solution pink.
What is reaction of acid with phenolphthalein?
Reaction of acid with phenopthalien turns colourless. For basic medium, it turns pink.
What is the reaction of base with phenolphthalein answer?
when phenolphthalein reaction with acids ( colourless). it reacts with bases it turns pink.
How does phenolphthalein obtain phenol?
* We can carry out synthesis of phenolphthalein by condensation of phenol with phthalic anhydride in the presence of an acid (H2SO4). * Phenols are heated with phthalic anhydride and conc. H2SO4 to form phenolphthalein.
What is the effect of phenolphthalein in soap solution?
In Acidic solution phenolphthalein is colourless but in basic it gives pink colour. Soap is generally basic in nature so that soap solution will be basic. Thus Phenolphthalein shows pink colour in basic solution and in soap solution.
What kind of colour change occurs in phenolphthalein solution on the addition of potassium hydroxide?
pink color
In alkaline solution, phenolphthalein gives pink color as it works as an indicator which shows its endpoint when it reacts with hydroxide ions of the base. It is a commonly used indicator in acid-base titrations. In acidic solution when acid is added, phenolphthalein gives a colorless solution.
What is the function of phenolphthalein as an indicator?
How does phenolphthalein function as an indicator? Phenolphthalein is a colourless, weak acid that is widely used as an indicator in titration experiments to indicate the endpoint of the titration. The endpoint is indicated by the formation of a pink colour since this compound dissociates to form pink anions when dissolved in water.
What happens when Phenolphthalein is ionized?
Colour Change of Phenolphthalein Ionization is the process that is responsible for the colour change of the compound (Phenolphthalein). Besides, ionization occurs when a molecule loses or gain an electron, which gives the molecule a positive or negative charge.
Why does phenolphthalein turn pink in an alkaline solution?
Also, it turns in pink colour in an alkaline solution or base. Moreover, the compound remains colourless in acids but starts to turn pink on pH 8.2 and continues to turn bright purple in strong bases. Ionization is the process that is responsible for the colour change of the compound (Phenolphthalein).
Is phenolphthalein acidic or basic or neutral?
Is phenolphthalein acidic or basic? Phenolphthalein, an organic compound with the chemical formula C20H14O4, is a weak acid which can be used as an indicator for acid-base titrations. In acidic solutions, the compound is colourless. It is pinkish in simple solutions (with the transition occurring around pH 9).