water hardness
Complexometric Determination of Water Hardness by EDTA Titration
Bonnie Abella
Dr. Asmita Kane Budruk
2/09/2014
Abstract: the complexometric EDTA titration was used to determine the salt substance in the water. This technique for the unknown sample 154 produced a water hardness of 8.43 x105=mg/L CaCO3 from the collected data which corresponds to the typical value from the city of Tempe.
Introduction
When the water from the rain collects impurities by dissolving the salt that is exist in the soil. These particular salts include ions of sodium, magnesium, calcium, iron, and other metals. These particular impurities are what you will see on the glass door of the shower after it has been cleaned. Calcium ions are what cause the majority of water hardness. The water hardness arises from the existence of metal ions with a charge of +2 or higher. Water hardness is reported in u nits of mg/L or ppm anticipated to one mg of solute has millionth of mass of a liter of water. The goal of this experiment was to determine the concentration of the metal ions impurities of an unknown sample of hard water by accomplishing the technique of complexometric titration with EDTA. The data from the experiment was evaluated against the normal range for water hardness from the city of Tempe.
Methods
The procedures from the CHM 152 lab manual were followed (1). A 10 mL transfer pipet was used to add 10.00 mL of standardized calcium ion solution to 250 mL Erlenmeyer flask. A magnetic stir bar was used for stirring the solution. The unknown water sample number 154 was mixed with 3 mL of ammonia/ammonium chloride buffer (pH10), and four drops of Eriochrome Black T indicator solution. Then it was titrated three times from 0.004 M disodium EDTA solution. At the endpoint, I have to wait for the color to change from pink to blue. The M disodium EDTA solution was made in the lab from 0.8492 g of Na2EDTA that was added to 500 mL of
Bonnie Abella
Dr. Asmita Kane Budruk
2/09/2014
Abstract: the complexometric EDTA titration was used to determine the salt substance in the water. This technique for the unknown sample 154 produced a water hardness of 8.43 x105=mg/L CaCO3 from the collected data which corresponds to the typical value from the city of Tempe.
Introduction
When the water from the rain collects impurities by dissolving the salt that is exist in the soil. These particular salts include ions of sodium, magnesium, calcium, iron, and other metals. These particular impurities are what you will see on the glass door of the shower after it has been cleaned. Calcium ions are what cause the majority of water hardness. The water hardness arises from the existence of metal ions with a charge of +2 or higher. Water hardness is reported in u nits of mg/L or ppm anticipated to one mg of solute has millionth of mass of a liter of water. The goal of this experiment was to determine the concentration of the metal ions impurities of an unknown sample of hard water by accomplishing the technique of complexometric titration with EDTA. The data from the experiment was evaluated against the normal range for water hardness from the city of Tempe.
Methods
The procedures from the CHM 152 lab manual were followed (1). A 10 mL transfer pipet was used to add 10.00 mL of standardized calcium ion solution to 250 mL Erlenmeyer flask. A magnetic stir bar was used for stirring the solution. The unknown water sample number 154 was mixed with 3 mL of ammonia/ammonium chloride buffer (pH10), and four drops of Eriochrome Black T indicator solution. Then it was titrated three times from 0.004 M disodium EDTA solution. At the endpoint, I have to wait for the color to change from pink to blue. The M disodium EDTA solution was made in the lab from 0.8492 g of Na2EDTA that was added to 500 mL of