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Experiment 28 Data and Calculations: Determination of the Hardness of Water Mass of beaker plus CaCO3 102.090 g Volume Ca2+ solution prepared 250 mL Mass of beaker less sample 101.683 g Molarity of Ca2+ 0.01624 M Mass of CaCO3 sample 0.407 g Moles Ca2+ in each aliquot titrated 0.00406 moles Number of moles CaCO3 in sample (Formula mass = 100.1) 0.0041 moles Standardization of EDTA Solution Determination of blank: Initial buret reading 0.00 mL Final buret reading 2.20 mL Volume of blank 2.20 mL Titration I II III Initial buret reading 2.20 mL 0.00 mL 0.00 mL Final buret reading 36.60 mL 34.75 mL 34.40 mL Volume of EDTA 34.40 mL 34.75 mL 34.40 mL Volume of EDTA used to titrate blank 2.20 mL 2.20 mL 2.20 mL Volume of EDTA used to titrate Ca2+ mL mL mL Molarity of EDTA = moles Ca2+ in aliquot x 1000 / volume of EDTA required (mL) M M M Mean molarity of EDTA: M Standard deviation in molarity of EDTA: M

          Experiment 28
Data and Calculations: Determination of the Hardness of Water
Mass of beaker plus CaCO3 102.090 g
Volume Ca2+ solution prepared 250 mL
Mass of beaker less sample 101.683 g
Molarity of Ca2+ 0.01624 M
Mass of CaCO3 sample 0.407 g
Moles Ca2+ in each aliquot titrated 0.00406 moles
Number of moles CaCO3 in sample (Formula mass = 100.1) 0.0041 moles
Standardization of EDTA Solution
Determination of blank:
Initial buret reading 0.00 mL
Final buret reading 2.20 mL
Volume of blank 2.20 mL
Titration I II III
Initial buret reading 2.20 mL 0.00 mL 0.00 mL
Final buret reading 36.60 mL 34.75 mL 34.40 mL
Volume of EDTA 34.40 mL 34.75 mL 34.40 mL
Volume of EDTA used to titrate blank 2.20 mL 2.20 mL 2.20 mL
Volume of EDTA used to titrate Ca2+ mL mL mL
Molarity of EDTA =
moles Ca2+ in aliquot x 1000 / volume of EDTA required (mL) M M M
Mean molarity of EDTA: M Standard deviation in molarity of EDTA: M

Experiment 28
Data and Calculations: Determination of the Hardness of Water
Mass of beaker plus CaCO3 102.090 g
Volume Ca2+ solution prepared 250 mL
Mass of beaker less sample 101.683 g
Molarity of Ca2+ 0.01624 M
Mass of CaCO3 sample 0.407 g
Moles Ca2+ in each aliquot titrated 0.00406 moles
Number of moles CaCO3 in sample (Formula mass = 100.1) 0.0041 moles
Standardization of EDTA Solution
Determination of blank:
Initial buret reading 0.00 mL
Final buret reading 2.20 mL
Volume of blank 2.20 mL
Titration I II III
Initial buret reading 2.20 mL 0.00 mL 0.00 mL
Final buret reading 36.60 mL 34.75 mL 34.40 mL
Volume of EDTA 34.40 mL 34.75 mL 34.40 mL
Volume of EDTA used to titrate blank 2.20 mL 2.20 mL 2.20 mL
Volume of EDTA used to titrate Ca2+ mL mL mL
Molarity of EDTA =
moles Ca2+ in aliquot x 1000 / volume of EDTA required (mL) M M M
Mean molarity of EDTA: M Standard deviation in molarity of EDTA: M

Added by Rachel G.

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