What is the principle of EDTA titration explain with example?
What is the principle of EDTA titration explain with example?
EDTA is Ethylene diamine tetra acetic acid. It dissolves in water with great difficulty, but its disodium salt dissolve in water quickly & completely It is hexa dentate ligend. It binds the metal ions in water to give stable chelate complex. Hence it is called as complexometric titration method.
What does EDTA titration measure?
Water hardness can be measured using a titration with ethylenediaminetetraacetic acid (EDTA). The ionised form of EDTA is shown on the right. EDTA dissolved in water forms a colourless solution. An indicator, known as a metal ion indicator, is required for the titration.
How is strength of EDTA calculated?
- Molarity.
- EDTA (mol / L)
- = 0.01000 L × 0.01603 mol / L ×
- 1 mol EDTA.
- 1 mol Zinc.
- ×
- 0.01625 L.
How do you calculate the normality of EDTA solution?
- You can use this formular, conc in g/dm3 =molar mass/valency * normality.
- The valency of EDTA is 4.
- Molar mass of EDTA is 294.
- Normality is 1.
- Substitute the above parameters in to the formulae.
- Conc in g/dm3 = 294/4 *1=73.5.
- Dry some quantity of EDTA and weight exactly 73.5g.
What is complexometric titration give one example?
Complexometric titration (sometimes chelatometry) is a form of volumetric analysis in which the formation of a colored complex is used to indicate the end point of a titration. Complexometric titrations are particularly useful for the determination of a mixture of different metal ions in solution.
What is the example of self indicator?
potassium permanganate
A best example of self-indicator is potassium permanganate which plays as self-indicator in oxidation reduction titration by disappearing or again showing its pink color while the reaction is finished.
How does EDTA determine water hardness?
Add 1 mL of ammonia buffer to bring the pH to 10±0.1. Add 1 or 2 drops of the indicator solution. If there is Ca or Mg hardness the solution turns wine red. Add EDTA titrant to the sample with vigorous shaking till the wine red colour just turns blue.
Why is pH 10 buffer used in EDTA titration?
pH 10 buffer is used in EDTA titration because in EDTA Y4- is predominant, and we want Y4- to react with the metal ions that are present in the titration solution. This can be achieved by using a pH 10 buffer.
