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Analyze An Unknown And A Real World Sample Of Hard Water Chelated By Eda

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Purpose:
The purpose of this lab is to analyze an unknown and a real world sample of hard water chelated by EDTA by a titrimetric method. In this lab, the indicator is carefully selected to examine and titrate the magnesium and calcium metal ions in each of the four water samples. To calculate the experimental hard water sample’s concentration the average moles was found and then used to find the 95% CI and standard deviation which gives an experimental concentration of Ca2+ in parts per million.
As per lab manual1, except a second 500ml flask of EDTA solution was made and heated over stove to help dissolve the solid. Also, an extra 5ml f sodium chloride was added to further increase the chances of dissolving the solid EDTA. The given molecular weight of the solid NaEDTA•H2O was 292.23 instead of the manual molecular weight. …show more content…

The determined concentration of the calcium ions was 352.3 PPM. To find the water hardness, 1.4664 grams of the given EDTA solution was weighed and combined with 500 mL of deionized water. 5mL of a 3M Sodium Hydroxide and 5 mL of the 0.10 M Magnesium chloride was then added to make the titrant, Na2EDTA solution. The EDTA will then react with any calcium metals ions present.
Calcium carbonate was used to standardize the EDTA solution. During the standardization titration, there were two attempts made at dissolving the calcium carbonate. On the first attempt, sodium hydroxide was added along with the magnesium but would not dissolve completely. On the second attempt, an extra 5 mL of sodium hydroxide was added to help dissolve the calcium carbonate. After the solids dissolved over a heated stove, the magnesium was added. All of the water hardness comes from the Ca2+ of the calcium

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