Why does EDTA need to be standardized?
Since [Metal ion]+ is unknown, you can make no measurement of the amount present, unless you know [EDTA] fairly accurately. And thus a known mass of primary standard is required to standardize, to calibrate the titration.
What are secondary standards?
A secondary standard is a substance whose active agent contents have been found by comparison against a primary standard. This means it is usually standardized against a primary standard. Secondary standard solutions are used to calibrate analytical equipment and analytical techniques.
Why we use EDTA in complexometric titration?
The most common indicators in complexometric titrations are organic dyes which function by forming a colored complex with the metal ion being titrated. During the reaction, EDTA replaces the indicator to form a more stable complex with metal and when the reaction is completed the change for the color is observed.
Why do we use EDTA in complexometric titration?
What do you mean by standardized?
to bring to or make of an established standard size, weight, quality, strength, or the like: to standardize manufactured parts. to compare with or test by a standard. to choose or establish a standard for. verb (used without object), stand·ard·ized, stand·ard·iz·ing. to become standardized.
Which primary standard solution is used for the standardization of EDTA which indicator is used for this titration?
Add 30 ml of 0.1 M Disodium Edetate (prepared) from the burette with constant stirring. Add 15 ml of Sodium Hydroxide solution with constant stirring. Add 300 mg of Hydroxy Naphthol Blue solution as an indicator.
How do you make a standard EDTA solution?
EDTA Solution Preparation Weigh out approximately 2 g of reagent grade disodium EDTA into a 250 mL beaker. Add 0.05 g magnesium chloride hexahydrate, three pellets of NaOH and add about 200 mL of distilled water to dissolve. The EDTA will dissolve slowly over a period of a half an hour.