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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Also, it can form scums that might clog the drainage system starting from the pipe and might cause several plumbing dilemmas Dvorak and Skipton, Use this volume of EDTA as a guide in repeating the titration.

Conversely, it does not affect much of the whole process since the indicated linearity of the results is precise, though the accuracy is not described.

Use the wash bottle to wash the spatula over the funnel to transfer any remaining EDTA into the flask. Using mL volumetric flask, Magnesium will be displaced by identical amount of calcium, and it will be titrated later, not changing final result. Help Center Find new research papers in: Water hardness is a measure of the amount of calcium and magnesium salts dissolved in water. There are no health hazards associated with water hardness, however, hard water causes scale, as well as the reduced lathering of soaps.

Two more replicates were done to obtain the average hardness of water. The average total hardness of the sample is To calculate water hardness use EBAS – stoichiometry calculator. Use a clean, dry, spatula to transfer some of the EDTA from the watchglass to the funnel. From its equivalence point with which the color changed approaching its endpoint, the molarity of EDTA was determined in standardization obtaining 0. Do you understand this? Complexometric titration is one of the best ways of measuring total water hardness.

Add 2 drops of indicator such as Eriochromschwartz-T which will turn wine-red in the ammoniated water. Accurately weigh out the required amount of EDTA onto a watchglass. Balancer and stoichiometry calculator operating systems: The ionised form of EDTA is shown on the right.


Titrations that are based on complex formation are called complexometric titration. The use of EDTA as a complexometric titrant for metal ions has been investigated in the past few years Hamilton, et al, Water hardness is measured in parts per million or milligrams per liter.

Moreover, magnesium is an important nutrient for plants, and is a part of chlorophyll Streitweiser and Heathcock, Deionised water can be poured into the flask using the funnel until the volume of solution in the flask is a bit below the mark on the flask. Then, two milliliters of the buffer solution and five drops of indicator solution were added to the titrand. We will also need indicator – either in the form of solution, or ground with NaCl – mg of indicator plus 20 g of analytical grade NaCl.

Determining Total Hardness in Water Chemistry Tutorial

In general this is a simple titration, with no other problems then those listed as general sources of titration errors. Repeat the titration until you have 3 results EDTA volumes that agree to with 0.

Do you know this? In addition with this, the water system in the laboratory should need treatment such as water softening. Download determination of water hardness reaction file, open it hardnss the free trial version of the stoichiometry calculator.

Nonetheless, high levels of total hardness are not considered a health concern. 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. Experimenters are now able to learn the basics and techniques in this kind of titration.

Use the wash bottle to wash any remaining EDTA off the watchglass and into the funnel. Seannekate, my lab partner was able to contribute effectively in proper handling of the instrument and other necessary calculations for the data. Thus, for the end point, we should use the same indicator we use when titrating magnesium – that is Eriochrome Black T. In contrary, calcium is an important component of cell walls of aquatic plants, and of the bones or shells of aquatic organisms Hepler, After that, the CaCl 2 solution was titrated with the Detedmination solution until the color changed from wine red to pure blue.


Moles of calcium and magnesium ions in hard water sample in conical flask: It is also not good for fish tanks.

Determination of water total hardness by complexometric titration

Make a standard solution of EDTA. At the equivalence point of the titration: This could have been the reason why lathering coplexometric the soap is a little hard but rinsing it off is easy. Perform calculations to determine the concentration of calcium and magnesium ions in the hard water.

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Complexation Titration: Determination of Total Hardness of Water | Gabriel Lerona –

Place a beaker under the burette, and run the EDTA waetr slowly and carefully through the burette until the bottom of the meniscus sits exactly on the 0. About us Feedback Determination of water total hardness by complexometric titration.

Make sure the stopcock on the burette is closed!

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. Use a small amount of water from a wash bottle filled with deionised water to wash the EDTA out of the funnel and into the flask.

Determination of Total Hardness of Water. Calcium and magnesium ions are kept in solution with the aid of a weak complexing reagent such as the titratiln used in this example, or tartrate is also used.