EDTA Titration You are using a titration between EDTA and "Hard Water" to determine the hardness of the water. "Hard Water" is due to dissolved ions such as Ca", Mg*, and Fe*. Water containing these dissolved ions is called "Hard Water" because when certain anions are added to this "“Hard Water" precipitates will form. One common precipitate we call "soap scum" forms between "Hard Water" ions and the anions commonly found in many soaps and detergents. When determining water hardness, we treat all the "Hard Water" cations as Ca2+. The reaction taking place between Ca²* and EDTA takes place in a one to one mole ratio. Water hardness is commonly reported in units of g CaCO3/1,000,000 grams of water. This would be parts per million. 1 gram of CaCO3 in 1,000,000 grams of water would give a water hardness of 1 ppm. The table below contains the information you need to know to determine the hardness of a "Hard Water" sample, in parts per million. Concentration of EDTA solution 0.0252 M Volume of "Hard Water" titrated Density of "Hard Water" titrated Volume of EDTA Solution Required 100.0 mL 1.013 g/ml 24.10 ml Use this data to determine the hardness of this water sample in units of ppm CaCO3.
EDTA Titration You are using a titration between EDTA and "Hard Water" to determine the hardness of the water. "Hard Water" is due to dissolved ions such as Ca", Mg*, and Fe*. Water containing these dissolved ions is called "Hard Water" because when certain anions are added to this "“Hard Water" precipitates will form. One common precipitate we call "soap scum" forms between "Hard Water" ions and the anions commonly found in many soaps and detergents. When determining water hardness, we treat all the "Hard Water" cations as Ca2+. The reaction taking place between Ca²* and EDTA takes place in a one to one mole ratio. Water hardness is commonly reported in units of g CaCO3/1,000,000 grams of water. This would be parts per million. 1 gram of CaCO3 in 1,000,000 grams of water would give a water hardness of 1 ppm. The table below contains the information you need to know to determine the hardness of a "Hard Water" sample, in parts per million. Concentration of EDTA solution 0.0252 M Volume of "Hard Water" titrated Density of "Hard Water" titrated Volume of EDTA Solution Required 100.0 mL 1.013 g/ml 24.10 ml Use this data to determine the hardness of this water sample in units of ppm CaCO3.
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Transcribed Image Text:EDTA Titration
You are using a titration between EDTA and "Hard Water" to determine the hardness of the water.
"Hard Water" is due to dissolved ions such as Ca", Mg*, and Fe*. Water containing these dissolved
ions is called "Hard Water" because when certain anions are added to this "“Hard Water" precipitates
will form. One common precipitate we call "soap scum" forms between "Hard Water" ions and the
anions commonly found in many soaps and detergents. When determining water hardness, we treat
all the "Hard Water" cations as Ca2+.
The reaction taking place between Ca²* and EDTA takes place in a one to one mole ratio.
Water hardness is commonly reported in units of g CaCO3/1,000,000 grams of water. This would be
parts per million. 1 gram of CaCO3 in 1,000,000 grams of water would give a water hardness of 1
ppm.
The table below contains the information you need to know to determine the hardness of a "Hard
Water" sample, in parts per million.
Concentration of EDTA solution
0.0252 M
Volume of "Hard Water" titrated
Density of "Hard Water" titrated
Volume of EDTA Solution Required
100.0 mL
1.013 g/ml
24.10 ml
Use this data to determine the hardness of this water sample in units of ppm CaCO3.
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