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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Determination of total water hardness by complexometric titration

An indicator, known as a metal ion indicator, is required for the titration. Data Analysis for Hatdness This error is equivalent to 0. Accurately weigh out the required amount of EDTA onto a ritration. This experiment is expected to yield a result that conforms to our abovementioned hypothesis.

To do so we can acidify the solution with hydrochloric acid, boil it, and then neutralize with ammonia. If solutions contains carbonates, they should be removed as they can interfere with end point detection. However, in this experiment, an average of Fundamentals of Analytical Chemistry.

For example, to prepare mL of a 0.

Balancer and stoichiometry calculator operating systems: Experimenters are now able to learn the basics and techniques in this kind of titration. Lerona, Paul Gabriel E. The structure of EDTA has six potential sites for bonding a metal ion: Moles of calcium watr magnesium ions in hard water sample in conical flask: Eriochromshwartz-T Erio T is a suitable indicator.


In general, there are many applications where ability to easily determine water hardness is very important. Calcium carbonate concentration expressed in parts per million are usually the criteria for the determination if a particular water sample is hard. This implies that the water system in the laboratory should be treated to avoid further plumbing problems, titratjon this does not necessarily implies that it imposes a health risk, it is could be only alarming if other heavy metals are present, thus, further tests should be done.

A few drops of 1: Run some EDTA through the burette and into the flask until the indicator turns sky-blue. The use of EDTA as a complexometric titrant for metal ions has been investigated in the past few years Hamilton, et al, Play the game now!

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Determination of water total hardness by complexometric titration

Water hardness is measured in parts per million or milligrams per liter. Log In Sign Up. Moreover, magnesium is an important nutrient for ittration, and is a part of chlorophyll Streitweiser and Heathcock, The most likely problem is spotting the end point, which is not always sharp. Use the wash bottle to wash the spatula over the funnel to transfer any remaining EDTA into the flask. Remove the beaker and dispose of its contents appropriately.


Use a clean conical flask that has been rinsed with tiitration water. Please do not block ads on this website. Make sure the stopcock on the burette is closed! Do you know this? Further applications of EDTA and other complexometric titrations can be very useful in industrial and other health aspects. Thus, for the end point, we should use the same indicator we use when titrating magnesium – that is Eriochrome Black T.

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 ddetermination turn wine-red in the ammoniated water. Online Journal Titfation, P.

To maintain the pH at around 10, tittation buffer soluton is required for the titration. Use the wash bottle to wash any remaining EDTA off the watchglass and into the funnel. 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.

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