What is the purpose of an indicator used in acid base titrations?
Acid-base indicators are most often used in a titration to identify the endpoint of an acid-base reaction. They are also used to gauge pH values and for interesting color-change science demonstrations.
How does indicator affect titration?
If a large amount of indicator is used, the indicator will effect the final pH, lowering the accuracy of the experiment. The indicator should also have a pKa value near the pH of the titration’s endpoint. For example a analyte that is a weak base would require an indicator with a pKa less than 7.
What is the purpose of an indicator in the solution with an unknown concentration?
Question: What is the purpose of an indicator in the solution with the unknown concentration? It tells when there is enough acid in the solution It tells when the equivalence point is obtained To neutralize the solution It tells when there is enough base in the solution.
How do you know what indicator to use in titration?
You just need enough so that the color is visible once the pH becomes basic enough. If you were titrating a large volume, you might need more than a couple of drops, but 2 drops is enough to be sure that the color will be visible in a typical lab-scale titration vessel. One drop would probably even work.
Why doesn’t the indicator affect the titration results?
In all titrations, the amount of indicator added to the solution to be titrated is just a small amount. This is because even at very low concentration…
What is the purpose of indicator?
The common application of indicators is the detection of end points of titrations. The colour of an indicator alters when the acidity or the oxidizing strength of the solution, or the concentration of a certain chemical species, reaches a critical range of values.
What is the use of an indicator?
A substance that can be added to the reaction mixture to indicate the equivalence point of the titration. Colored indicators are often used to measure pH. These indicators are a different color in a basic environment than in an acidic environment.
What are the importance of indicators?
Indicators help us know the scope and magnitude of problems, whether we have enough resources to fix a problem, and whether we are making progress toward solving problems.
What makes a good indicator chemistry?
In all cases, though, a good indicator must have the following properties: The color change must be easily detected. The color change must be rapid. The indicator molecule must not react with the substance being titrated.