Determining the total hardness in water using complexometric titration with EDTA tutorial suitable for chemistry students. Complexation Titration: Determination of Total Hardness of Water The use of EDTA as a complexometric titrant for metal ions has been investigated in the past . You will use EDTA complexometric titration to determine the hardness of a responsible for hardness, and total water hardness is defined as the sum of the.

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The precision is expressed in coefficient of variation that is in parts per thousand. Using mL volumetric flask, At this point the endpoint is close. This could have been the reason why lathering of the soap is a little hard but rinsing it off is easy.

Eriochromshwartz-T is wine-red in hard water, but turns sky blue in the presence of free EDTA ions in the wateer. Moreover, the objective of this experiment is to standardize the EDTA solution using the standard CaCO3 to determine the hardness of water in the laboratory. Skip to main content.

Take the test now! Perform calculations to determine complexoketric concentration of calcium and magnesium ions in the hard water. However, this is a very rare bu. Use the wash bottle to give the funnel itself a final wash to ensure any remaining EDTA is washed into the flask. Continue this process until no more EDTA is left on the watchglass. In general this is a simple titration, with no other problems then those listed as general sources of titration errors. Add 2 drops of indicator such as Eriochromschwartz-T which will turn wine-red in the ammoniated water.


Seannekate, my lab partner was able to contribute effectively in proper handling of the instrument and other necessary calculations for the data. Fill the burette with the EDTA solution to well above the 0. Consecutively, after reading the initial volume of the titrant in the buret, the sample was titrated with the EDTA solution until the color changed from wine red to pure blue.

Experimenters are now able to learn the basics and techniques in this kind of titration.

Determination of water total hardness by complexometric titration

Chemistry of Hard Water and Soft Water. However, the pre-endpoint wine red color was not observed, instead, a reddish purple color was observed. Water hardness is measured in parts per million or milligrams per liter.

There are no health hazards associated with water hardness, however, hard water causes scale, as well as the reduced lathering of soaps. Conversely, it does not affect much of the whole process since the indicated linearity of the results coplexometric precise, though the accuracy is not described. Magnesium will be displaced by identical amount of calcium, and it will be titrated later, not changing final result.


Determining Total Hardness in Water Chemistry Tutorial

Titrations that are based on complex formation are called complexometric titration. Online Journal Hepler, P. The determination of the hardness of water is a useful analytical procedure that gives a measure of the quality of water for industrial and household uses. Can you apply this? Nonetheless, high levels of total hardness are not considered a health concern.

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Note the approximate endpoint of the titration. Small excess of ammonia doesn’t hurt, as we finally add ammonia buffer and change of pH by several tenths is not a problem. Do you know this?

Keep swirling the conical flask during the titration to mix the contents. Determination of the Total Hardness of Water The tap water flowing from through faucet of the laboratory sink was chosen as the source of our water sample. Consequently, the results showed that the water in the Chemistry laboratory is very hard containing