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In HCl and NaOH titration which indicator is used?
Phenolphthalein is commonly used as an indicator in the titration of hydrochloric acid (HCl) with sodium hydroxide (NaOH). Phenolphthalein changes color from colorless to pink at the endpoint of the titration when all the acid has been neutralized by the base.
What is the purpose of adding phenolphthalein during titration?
Phenolphthalein is added as an indicator during titration to visually indicate the endpoint of the reaction. It changes color at a specific pH, usually from colorless to pink, which helps the titrator determine when the reaction is complete and the equivalence point has been reached.
Why did the solution turn to pink at the end of the titration?
The pink color at the end of the titration could be due to the indicator phenolphthalein, which turns pink in basic solutions. This indicates that the solution has reached its endpoint and is slightly basic.
Why did the solution turn to pink at the end point of the titration?
The pink color indicates that the pH has reached a specified endpoint in the titration process. In acid-base titrations, a pink color is often associated with the addition of an indicator such as phenolphthalein which changes color at a specific pH, typically around pH 8.2-10. This color change signals the completion of the reaction between the acid and base being titrated.
What structure of phenolphthalein indicator and the reaction of the color exchange in the titration?
Phenolphthalein is a chemical compound with a chemical formula C20H14O4. In acidic conditions, it is colorless, and in basic conditions, it turns pink or magenta due to the formation of an anion with a conjugated system of double bonds. In a titration, the color change of phenolphthalein indicates the endpoint of the reaction, where the amount of acid or base being titrated has been fully neutralized.
In HCl and NaOH titration which indicator is used?
Phenolphthalein is commonly used as an indicator in the titration of hydrochloric acid (HCl) with sodium hydroxide (NaOH). Phenolphthalein changes color from colorless to pink at the endpoint of the titration when all the acid has been neutralized by the base.
What is the purpose of adding phenolphthalein during titration?
Phenolphthalein is added as an indicator during titration to visually indicate the endpoint of the reaction. It changes color at a specific pH, usually from colorless to pink, which helps the titrator determine when the reaction is complete and the equivalence point has been reached.
Why did the solution turn to pink at the end of the titration?
The pink color at the end of the titration could be due to the indicator phenolphthalein, which turns pink in basic solutions. This indicates that the solution has reached its endpoint and is slightly basic.
How could you determine whether phenolphthalein remains in the residue of a titration reaction?
The easiest way is to add back some of the solution you were titrating. If phenolphthalein remains, it will react with the solution and change back to purple. Incidentally, phenolphthalein will always remain in the solution of the titration reaction - it changes color depending upon the pH of the solution, but the indicator itself is not affected by the titration reaction.
Why did the solution turn to pink at the end point of the titration?
The pink color indicates that the pH has reached a specified endpoint in the titration process. In acid-base titrations, a pink color is often associated with the addition of an indicator such as phenolphthalein which changes color at a specific pH, typically around pH 8.2-10. This color change signals the completion of the reaction between the acid and base being titrated.
What structure of phenolphthalein indicator and the reaction of the color exchange in the titration?
Phenolphthalein is a chemical compound with a chemical formula C20H14O4. In acidic conditions, it is colorless, and in basic conditions, it turns pink or magenta due to the formation of an anion with a conjugated system of double bonds. In a titration, the color change of phenolphthalein indicates the endpoint of the reaction, where the amount of acid or base being titrated has been fully neutralized.
Why phenolphthalein cannot be used as an indicator for titrating a weak base against a strong acid?
Phenolphthalein is not suitable for this titration because its color change occurs over a pH range that is beyond the equivalence point of the weak base and strong acid titration. At the equivalence point of this titration, the solution is acidic, which is below phenolphthalein's color change pH range. This can lead to inaccurate results and difficulty in determining the endpoint of the titration.
Why does a pink color appear and then disappear quickly in the titration experiment?
Let's say that your titrant is NaOH. What happens is as there are OH- ions present the color changes into a pinkish hue, but the color disappears quickly because the H+ ions present in the sol'n take the OH- ions; so there is no color until the end point really =)
The end point of a titration indicates the?
The end point of a titration indicates the point at which the reaction has reached stoichiometric equivalence between the titrant and analyte. This is typically signaled by a noticeable change in a physical property, such as a color change in an indicator or a change in pH.
What indicator can you choose for the titration of oxalic acid with sodium hydroxide?
Phenolphthalein is a suitable indicator for the titration of oxalic acid with sodium hydroxide. It changes color from colorless to pink at the endpoint of the titration when the acid has been completely neutralized.
Why is phenolphthalein indicator not used in EDTA titration?
Phenolphthalein is not suitable for use in EDTA titration because it changes color at a pH range that is much lower than the pH range at which the EDTA-metal complex formation occurs. EDTA titration typically requires indicators that change color in a more acidic pH range.
Why is phenolphthalein is used in titration experiment?
it is used as an acid-base indicator
