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when we do not know nothing about the other titrant.

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Q: When should back titration be used instead of direct titration?
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When should back titration used instead of back titration?

when we do not know nothing about the other titrant.


What are complexometric titration method?

Direct titration, Indirect titration, back titration, replacement titration and so on


When to use back-titration instead of direct titration?

When you have passed the tipping point and the color indicator turns from it's color to the clear color of the original solution. Then you back titrate to color again.


How does back titration differ from a direct titration?

direct titration involves the direct and stepwise addition of a standard titrant to the analyte whilst the back titration involves reacting a standard excess titrant wth an analyte solution of an unknown concentration, then reacting the excess (left over) titrant with an analyte of known concentration to determine the concentration of excess titrant.


Why is a back titration sometimes used for an analysis rather than a direct titration?

Back titrations are used when a reaction occurring in the conical flask can not be detected using an indicator such as phenolphthalein. So, after this titration has been performed, the 'excess' is then titrated with something that can be detected more easily using phenolphthalein etc.


What is Back titration?

A back titration is a form of titraiton in which an excess of standard reagent is added and then the reverse of the titration is carried out.


What is a back titration?

A back titration is a form of titraiton in which an excess of standard reagent is added and then the reverse of the titration is carried out.


What difference between titration and back titration?

In fact, a back titration is carried out as in a very similar method to an ordinary titration. the only difference is in the context. Consider an unknown acid solution. Then a known amount of excess alkali was added to the solution and made them react. Then the process of finding the amount left from the alkali is known as the back titration.


Why is phenolphthalein an appropiate indicator for back titration?

it's not in all cases. Only for titration of weak acids.


Why is titration method applicable in aspirin analysis?

When I am using back titration and direct titration as my two methods for determining the purity of aspirin tablets. doesn't the direct titration not take into consideration of the excess sodium hydroxide added to the aspirin?In both these titrations when I reach the end-point it turns pink but I kept these solution the next day and they turned back to colourless. Is this meant to happen and what chemical reaction has happened here?I titrated this again with more sodium hydroxide till the end-point then added this to the overall amount of NaOH i added in the flask.Is the only difference between back titration and direct titration not addding the HCl at the end to determine the excess amount of NaOH?Are there any methods for direct titration.Would really appreciate any help.The best you can obtain is an end point lasting 20-30 seconds. Any excess base will slowly hydrolyze the ester and liberate acetate ion from the act's because aspirin is such a weak acid that it reacts slowly with the NaOH, making it difficult to accurately get a good endpoint in a reasonable time.With back titration, you react with an excess of NaOH (known amount), heat it to make the reaction go to completion quickly, then use HCl to determine the amount of NaOH that is remaining. This reaction will go quickly, and is much easier to measure.elylsalicylic acid,aspirin.


What is the chemical process for back titration?

The chemical process for back titration is to titrate the analyte past the original end point/equivalence point, and then BACK titrate the excess titrant to equivalence.


What is blank titration?

Types of titrations 1. Direct titration: analyte + titrant → product 2. Blank titration: titration of a solution not containing the analyte (check for errors) If the endpoint is unclear, we can use a . . . Back titration a. Excess of standard solution is added to analyte (and they react) - Step 1 b. A second standard titrates the excess (unreacted) standard - Step 2 Step 1: analyte + reagent 1 → product + excess reagent 1 Step 2: excess reagent 1 + reagent 2 → product