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The true equivalence point in these titration was at pH7 What is the pH range for the color change of phenolphthalein?
Phenolphthalein changes color in the pH range of approximately 8.2 to 10.0. This means that phenolphthalein starts to turn pink around pH 8.2 and turns completely pink at around pH 10.0. Since the equivalence point was at pH 7, phenolphthalein would not be the ideal indicator for this titration.
If the equivalence point of a titration is 5 what range of pH should the indicator be?
An indicator should have a pKa close to the expected pH at the equivalence point. For a titration with an equivalence point at pH 5, an indicator with a pKa in the range of 4 to 6 would be suitable for visual detection of the endpoint.
How is pH of 9 - 10 maintained during EDTA method?
During the EDTA method, a pH of 9 to 10 is maintained using a buffer solution, typically composed of ammonia and ammonium chloride or a similar buffer system. This alkaline pH is crucial as it enhances the solubility of metal ions and promotes the formation of stable EDTA complexes, ensuring accurate titration results. By controlling the pH within this range, the reaction efficiency is maximized, leading to more precise measurements of metal concentrations.
Why does the pH drop so fast during titration at a certain point?
When there is a buffer present, the buffer makes it difficult to change the pH of a solution. Say for instance a buffer keeps the pH around 6.5 +/- 0.2 . The buffer only works when the pH is in this range. If too much acid or too much base is added, taking the pH out of this range the pH will change quickly, even if only a little extra base or acid is added to the solution.
WHY IT IS NECESSARY TO DILUTE THE VINEGAR TITRATION WITH O.1 m naoh?
Diluting the vinegar in a titration with 0.1 M NaOH is necessary to ensure that the reaction occurs within a measurable and interpretable range. Vinegar, being an acetic acid solution, can have a high concentration that may lead to overshooting the endpoint if not diluted. This dilution allows for a more accurate determination of the acetic acid concentration by providing a clearer endpoint and reducing the potential for errors in measurement. Additionally, it helps in achieving a more gradual reaction, improving the precision of the titration results.
What kind of indicators are used in precipitation titration?
Indicators used in precipitation titrations are typically complexometric indicators that form colored complexes with the analyte ions. These indicators change color when the endpoint of the titration is reached, signaling the completion of the precipitation reaction. Common complexometric indicators include EDTA, Eriochrome Black T, and Calconcarboxylic acid.
Is methyl orange the indicator used in the titration of na2co3 against hcl solution?
No, methyl orange is not commonly used as the indicator in the titration of Na2CO3 against HCl solution. Phenolphthalein is the indicator of choice for this titration, as the endpoint is at a pH of around 8.2, which is the color change range of phenolphthalein.
What kind of titrations are possible with phenolphthalein as indicator?
Phenolphthalein is commonly used in acid-base titrations because it changes color at a pH range of 8.2-10, making it ideal for determining the endpoint of the titration. It is also used in complexometric titrations to detect the presence of metal ions, as phenolphthalein can form colored complexes with certain metals.
How you select that which indicator should be used in any titration?
The selection of an indicator for a titration is based on the pH range over which the titration will occur. The indicator should have a color change that aligns with the pH at the equivalence point of the titration. Choosing an indicator with a pH range that encompasses the equivalence point will ensure accurate endpoint detection.
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 bromocresol green a suitable indicator in the titration of hydrochloric acid with sodium tetraborate?
Bromocresol green changes color in the pH range of 3.8 to 5.4, which is close to the pH at the endpoint of the titration of hydrochloric acid with sodium tetraborate. This makes it a suitable indicator for this titration as it changes color around the equivalence point.
Why is phenolphthalein is used in titration experiment?
it is used as an acid-base indicator
What is the purpose for using phenolphthalein for an acid base titration?
Phenolphthalein is used as an indicator in acid-base titrations because it changes color at a specific pH range. In an acid-base titration, phenolphthalein changes from colorless to pink when the solution reaches a pH around 8.2-10, indicating the endpoint of the titration. This allows for a visual indication of when the reaction is complete.
The true equivalence point in these titration was at pH7 What is the pH range for the color change of phenolphthalein?
Phenolphthalein changes color in the pH range of approximately 8.2 to 10.0. This means that phenolphthalein starts to turn pink around pH 8.2 and turns completely pink at around pH 10.0. Since the equivalence point was at pH 7, phenolphthalein would not be the ideal indicator for this titration.
Why we use different range indicators different acids?
Different range indicators are used for different acids because the optimal pH range for each indicator varies based on the acid being titrated. It's important to choose an indicator that changes color around the equivalence point of the acid-base titration to accurately determine the endpoint of the reaction. By selecting the appropriate range indicator, you can ensure a more precise and reliable titration process.
What is the function of phenolphthalein in titration?
Phenolphthalein is a pH indicator commonly used in acid-base titrations. It changes color in a specific pH range (around pH 8.2 to 10), allowing the endpoint of the titration to be visually determined. This makes it easier to accurately measure the amount of titrant required to reach the equivalence point.
Which indicator is used in titration of naoh and h2so4?
Phenolphthalein is commonly used as an indicator in the titration of NaOH and H2SO4. It changes color from colorless to pink as the solution reaches a specific pH range, signaling the endpoint of the titration.
