A blank titration is one in which no analyte is present and only the solvent used in the sample solution is measured, which is employed to detect and correct systematic analysis errors.
A titration is a chemical method known as the volumetric or titrimetric method, it is a quantitative chemical analysis used for determining the precise amount of a solute in a sample solution.
The process involves drop-wise adding a known-concentration reagent (Titrant) to a solution containing an unknown-concentration reagent (Titrand) until the reaction between the two reagents is complete.
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The equivalence point is the point where the amount of the reactants is equal. A color change at the endpoint, which approximates equivalence, is usually indicated with the help of a chemical indicator. When it comes to process, applications, and goals, there are various types of titrations, such as acid-base titrations, redox titrations, precipitation titrations, and complexometric titrations.
What is a blank titration in chemistry?
A blank titration is one in which no analyte is present and only the solvent used in the sample solution is measured, which is employed to detect and correct systematic analysis errors.
“Blank titration is a titration performed on a solution that is similar to the sample solution except for the absence of the sample”
In a blank titration, a fixed and known concentration of titrant is titrated into a solvent with zero solutes. The absence of solute or sample is the only difference from normal titration. This allows the amount of the reactive compound in the simple solvent to be known, and therefore the inaccuracy to be determined in future titration experiments with this solvent.
Example of blank titration:
To check for possible causes of error in the blank solution, a blank titration is performed without an analyte. For example, De-ionized water is slightly acidic, which might affect the results of acid-base titrations. Hence, need to run a blank titration to determine the concentration of H3O+ in the water and use it to adjust your analyte's concentration. This is useful in the case of very precise concentration is required.
What is the reason for carrying out the blank determination?
Blank determination is a conclusive method that follows all steps of the analysis although it occurs without the use of a sample compound. It is used in the detection and correction of systematic analytical errors.
Why is it important to run a blank test?
Blank titration is performed to check that the solvent contains no compounds that may react with the titrant, or to estimate how much titrant would react with the pure solvent. This allows us to estimate the error that will occur during the actual titration experiment is conducted.
How to perform blank titration?
A blank titration is usually performed using the same process as a conventional titration. Titrant of known concentration which is filled in the burette is titrated with the solvent that has zero analytes which are poured in the conical flask. An indicator indicates the endpoint.
What is the endpoint of blank titration?
The endpoint of a blank titration is the same as a normal titration, in which the indicator causes the solution to change color.
How does a blank titration reduce titration error?
Blank titration can help to reduce titration error, as in the absence of solute the volume of titrant needed to reach the endpoint can be subtracted from the volume required in the presence of a solute.
Frequently asked questions (FAQ):
What is the difference between a direct titration and a back titration?
A direct titration involves adding a standard titrant to the analyte until the endpoint is reached, whereas a back titration involves adding an excess of standard titrant to the analyte and titrating the excess titrant to determine how much is in excess.
What materials do you need for titration?
Burette, pipette, conical flask, pipette stand, beaker, etc. are used to perform the titration.
What do you mean by blank and back titration?
Blank titration is a titration performed on a solution that is similar to the sample solution except for the absence of the sample, while a back titration is used when it is difficult to find an endpoint in a normal titration.
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