1 / 6

GROUP 2

from cse 3 group 2

Devanand1
Download Presentation

GROUP 2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Estimation of Hardness By EDTA Method Structure of EDTA: * The hardness of water is quantitatively measured by EDTA is used to determine the hardness. *EDTA can form 4 to 6 dative bonds with cations.

  2. Principle: *An indicator black-t is used which forms an unstable wine red complex with ca and mg ions at ph_10. *When this solution is titrated against EDTA solution, the color of the complex changes from wine red to pale blue

  3. Preparation of solutuions: Preparation of Standard Hard Water:- • Dissolve 1 gram of pure and dry CaCO3 in minimum quantity of dilute HCl and then evaporate the solution to dryness on water bath. • Dissolve the residue in distilled water to make 1 litre solution. • Each ml of this solution contains 1mg of CaCO3 equivalent hardness.

  4. Titrations: *Titration-1 Standardization of EDTA Titration between standard hard water & EDTA solution. *Titration 2: Determination of Total Hardness Titration between standard EDTA and hard water sample for total hardness *Titration 3: Determination of Permanent Hardness Titration between standard EDTA and hot water sample for permanent hardness

  5. Calculations: Total hardness of water = 𝑽𝟐 𝑽𝟏 x1000 Permanent hardness of water = 𝑽𝟑 𝑽𝟏 x1000 Temporary hardness of water = 𝑽𝟐−𝑽𝟑 𝑽𝟏 x1000

  6. Results: The amount of total, permanent and temporary hardness of given sample of water estimated by complexometric titration using standard solution of EDTA (Ethylene Diamine Tetra Acetic Acid) Precautions: *Always rinse the burette and take out the bubbles at the nozzle of the burette.  *Always rinse the burette and other flasks with distilled water before using.  *No tinge of reddish hue should remain at the endpoint, the solution should be clear blue.  *Titration should be performed slowly near the endpoint for the detection of sharp and correct endpoints. 

More Related