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It one of the titrations method to determine the permanent and temporary hardness of water.
Procedure;
step 1: standardise the edta solution
step 2: titrate against the hard water mixed with ebt until the colour changes from wine red to blue.
Then we can caluclate the normality using the formula
(n1) *(v1)=(n2)*(v2).
Posted by Krishna kanth yenumula.
EDTA titration of water is a method used to determine the total hardness of water by titrating the water sample with a known concentration of ethylenediaminetetraacetic acid (EDTA) solution. EDTA forms stable complexes with metal ions present in the water, such as calcium and magnesium, allowing for the determination of water hardness. By measuring the volume of EDTA solution required to complex all the metal ions in the water sample, the hardness of the water can be calculated.
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What colour changes you see in edta titration?
In EDTA titration, the color changes typically involve a transition metal complex forming with EDTA. For example, in the titration of calcium ions, a color change from red to blue indicates the formation of a complex between EDTA and calcium ions. This color change signals the endpoint of the titration.
Why is the pH of the medium important in edta titration?
The pH of the medium is important in EDTA titration because the formation of the metal-EDTA complex depends on the pH. At certain pH levels, the metal-EDTA complex formation is optimized, leading to accurate results. Deviations from the optimal pH can affect the stability of the complex and lead to incorrect titration results.
What is the purpose of standardizing EDTA in Complexometric titration?
Standardizing EDTA in complexometric titration is done to determine its exact molarity or concentration. This is important because the accuracy of the titration results depends on knowing the precise concentration of the EDTA solution being used. By standardizing EDTA, any errors in concentration can be corrected, ensuring accurate and reliable results in the titration process.
What are different types of EDTA titration?
Some types of EDTA titration include direct titration, back titration, complexometric titration, and chelatometric titration. These methods are commonly used to determine the concentration of metal ions in a solution by forming stable metal-EDTA complexes.
What is the function of hhsnna in edta titration?
In EDTA titration, hhsnna (hydroxylamine hydrochloride) is used to reduce any interfering metal ions present in the sample to prevent their titration by the EDTA solution. This helps ensure that the titration results are accurate and only reflect the concentration of the target metal ion being measured.
What colour changes you see in edta titration?
In EDTA titration, the color changes typically involve a transition metal complex forming with EDTA. For example, in the titration of calcium ions, a color change from red to blue indicates the formation of a complex between EDTA and calcium ions. This color change signals the endpoint of the titration.
Why is the pH of the medium important in edta titration?
The pH of the medium is important in EDTA titration because the formation of the metal-EDTA complex depends on the pH. At certain pH levels, the metal-EDTA complex formation is optimized, leading to accurate results. Deviations from the optimal pH can affect the stability of the complex and lead to incorrect titration results.
What is the purpose of standardizing EDTA in Complexometric titration?
Standardizing EDTA in complexometric titration is done to determine its exact molarity or concentration. This is important because the accuracy of the titration results depends on knowing the precise concentration of the EDTA solution being used. By standardizing EDTA, any errors in concentration can be corrected, ensuring accurate and reliable results in the titration process.
What are different types of EDTA titration?
Some types of EDTA titration include direct titration, back titration, complexometric titration, and chelatometric titration. These methods are commonly used to determine the concentration of metal ions in a solution by forming stable metal-EDTA complexes.
What is the function of hhsnna in edta titration?
In EDTA titration, hhsnna (hydroxylamine hydrochloride) is used to reduce any interfering metal ions present in the sample to prevent their titration by the EDTA solution. This helps ensure that the titration results are accurate and only reflect the concentration of the target metal ion being measured.
How does EDTA and titration work?
EDTA is a chelating agent that binds to metal ions. In titration, EDTA is used to determine the concentration of metal ions in a solution by forming a complex with the metal ion. The endpoint of the titration is identified by a color change indicator or a pH meter, indicating that all metal ions have reacted with EDTA.
What is the need for an ammonical buffer solution in the determination of hardness of water by edta titration?
An ammoniacal buffer solution is used in EDTA titration for the determination of water hardness because it helps to maintain a stable pH around 10. This pH is necessary for the formation of stable metal-EDTA complexes, which are required for accurate and precise titration results. The buffer solution prevents changes in pH that could affect the formation of these complexes and the accuracy of the titration.
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.
How do you measure permanent hardness by EDIT titration?
To measure permanent hardness by EDTA titration, first add a buffer solution to the water sample to maintain a stable pH. Then, titrate with standardized EDTA solution until the color changes indicating the endpoint. The volume of EDTA required to reach the endpoint can be used to calculate the concentration of the ions causing permanent hardness in the water.
Why you have to add buffer before titration with EDTA?
Adding a buffer solution before titration with EDTA helps to maintain a constant pH which is crucial for the formation of metal-EDTA complexes. The buffer solution prevents any fluctuations in pH that could affect the accuracy and precision of the titration results.
Why titration with standard hard water is carried out?
Titration with standard hard water is carried out to determine the concentration of calcium and magnesium ions in water samples. By titrating a known volume of hard water with a standardized solution of EDTA, the amount of calcium and magnesium ions present can be quantified based on the volume of EDTA solution needed to reach the endpoint. This helps in assessing the water hardness and determining the appropriate treatment methods for water softening.
Why is a solution containing a metal ion buffered before titration with EDTA?
Buffering the solution containing a metal ion before titration with EDTA helps maintain a constant pH, which is crucial for the accuracy and precision of the titration. The buffering prevents large pH changes that could affect the formation of metal-EDTA complexes and lead to errors in the titration results.
