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Why are only a few drops of indicator used in a titration?
Only a few drops of indicator are used in a titration to avoid affecting the results by introducing excessive impurities into the solution. The indicator is added to help visually determine the endpoint of the titration, where the reaction is completed. Adding more indicator than necessary can lead to errors in the measurements.
Why are indicators used in drops in titration?
Indicators are used in drops during titration to detect the endpoint of the reaction, which is when the reaction has reached completion. The indicator changes color when the pH of the solution changes, indicating that the correct stoichiometric amount of titrant has been added to the solution being titrated.
How much phenolphthalein indicator should be used?
Typically, 1-2 drops of phenolphthalein indicator are sufficient to use in an acid-base titration experiment. It is important not to use too much indicator, as it can affect the accuracy of the titration results.
What is the colour change in the titration of KOH with H2SO4 using methyl orange as the indicator?
The titration starts with the solution being yellow due to the presence of excess base (KOH). As the acid (H2SO4) is added, the solution turns from yellow to orange as the pH drops. Finally, the solution changes from orange to pink when all the base has been neutralized by the acid.
Which indicator is suitable for the titration of washing soda against HCL and why?
Phenolphthalein is a suitable indicator for titration of washing soda (sodium carbonate) against hydrochloric acid. This indicator changes color in the pH range of 8.2 to 10, making it ideal for this titration since the end point occurs when all the sodium carbonate has reacted to form sodium chloride and carbonic acid, resulting in a pH above 8.2.
Why are only a few drops of indicator used in a titration?
Only a few drops of indicator are used in a titration to avoid affecting the results by introducing excessive impurities into the solution. The indicator is added to help visually determine the endpoint of the titration, where the reaction is completed. Adding more indicator than necessary can lead to errors in the measurements.
Why are indicators used in drops in titration?
Indicators are used in drops during titration to detect the endpoint of the reaction, which is when the reaction has reached completion. The indicator changes color when the pH of the solution changes, indicating that the correct stoichiometric amount of titrant has been added to the solution being titrated.
How much phenolphthalein indicator should be used?
Typically, 1-2 drops of phenolphthalein indicator are sufficient to use in an acid-base titration experiment. It is important not to use too much indicator, as it can affect the accuracy of the titration results.
What is the colour change in the titration of KOH with H2SO4 using methyl orange as the indicator?
The titration starts with the solution being yellow due to the presence of excess base (KOH). As the acid (H2SO4) is added, the solution turns from yellow to orange as the pH drops. Finally, the solution changes from orange to pink when all the base has been neutralized by the acid.
Which indicator is suitable for the titration of washing soda against HCL and why?
Phenolphthalein is a suitable indicator for titration of washing soda (sodium carbonate) against hydrochloric acid. This indicator changes color in the pH range of 8.2 to 10, making it ideal for this titration since the end point occurs when all the sodium carbonate has reacted to form sodium chloride and carbonic acid, resulting in a pH above 8.2.
Why only use a few drops of phenolphthalein?
Using only a few drops of phenolphthalein is sufficient because it is a strong indicator and changes color quickly in reaction to changes in pH. Using a small amount helps to avoid overdosing the solution with the indicator, which could affect the accuracy of the titration.
Could you add drops of a solution that was indicated acid into a solution that was indicated base until they became neutral?
Yes, you can add drops of an acid solution into a basic solution until they reach neutral pH. This process involves titration, where you gradually add the acid solution until the pH reaches around 7, which is neutral. It's important to use an indicator or a pH meter to monitor the pH levels during this process.
How do you do a test to see if ink is an indicator?
To test if ink is an indicator, you can dip litmus paper or pH paper into the ink solution to see if there is a color change indicating a change in pH. You can also add a few drops of ink to a solution with known acidity or alkalinity to observe any visible changes in color. Additionally, you can perform a titration using the ink solution to determine its pH level.
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 is it that during titration of iodine or triiodine with thiosulphate the starch indicator should not be added until near the end point?
The Starch-Iodide complex is not very soluble in water, so the starch is added near the endpoint of an Iodine titration, when the Iodine concentration is low. This eliminates errors due to the fact that some Iodine may remain adsorbed on the complex and go undetected. so if you add the starch indicator only right near the end point when the solution is a light yellow colour the starch shouldn't complex and go lumpy.
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.
If a few drops of universal indicator is added to water changes red what pH value is it?
Its Ph value is less than 7, so it is acidic. The exact colour change needs to be compared visually with a standard universal indicator chart to determine the precise Ph value associated with that particular shade of red.
