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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However, in this experiment, an average of Hard water should be not used for washing it reduces effectiveness of detergents nor in water heaters and kitchen appliances like coffee makers that can be destroyed by scale. The obtained average molarity of Kf 0.

Perform calculations to determine the concentration of calcium and magnesium ions in the hard water. Water Hardness and Alkalinity.

The use of Wster as a complexometric titrant for metal ions has been investigated in the past few years Hamilton, et al, Record this volume of EDTA.

In general this is a simple titration, with no other problems then those listed as general sources of titration errors.

  AS 3660.1 PDF

Balancer and stoichiometry calculator. Moles of EDTA must be calculated using the hadness of the titration: Calcium carbonate concentration expressed in parts per million are usually the criteria for the determination if a particular water sample is hard.

Determination of total water hardness by complexometric titration

At the equivalence point of the titration: Thus, for the end point, we should use the same indicator we use when titrating magnesium – that is Eriochrome Black T. Fundamentals of Analytical Chemistry. Small excess of ammonia doesn’t hurt, as we finally add ammonia buffer and change of pH by several tenths is not a problem. Determination of Total Hardness of Water. To calculate water hardness use EBAS – stoichiometry calculator.

However, the pre-endpoint wine red color was not observed, instead, a reddish purple color was observed.

Determining Total Hardness in Water by Complexometric Titration

To maintain the pH at around 10, a buffer soluton is required for the titration. Skip to main content.

Consequently, the results showed that the water in the Chemistry laboratory is very hard containing Keep swirling the conical flask during the titration to mix the contents. Online Journal Hepler, P. Fundamentals of Analytical Chemistry by Douglas A.


Slowly add the EDTA 1 mL at a time until you start to see indications of a colour change in the solution, that is, a spot of blue appears before disappearing. At deetrmination point the endpoint is close. Further applications of EDTA and other complexometric titrations can be very useful in industrial and other health aspects.

Determining Total Hardness in Water Chemistry Tutorial

These findings suggest that the water source in the laboratory is very hard. Help Center Find new research papers in: For the standardization, Such explanations could have been also the possible reasons why liquid detergents synthetic soap are used in washing the glassware rather than the soap or bar hardnesss.

If solutions contains carbonates, they should be removed as they can interfere with end point detection.

Do the drill now! Accurately weigh out the required amount of EDTA onto a watchglass. Read mass of calcium carbonate in the titrated sample in the output frame.