Question

Date DATA SHEET: EXPERIMENT 17 Standardization of EDTA Solution A. 8.0003 Concentration of standard Ca2 solution 1. Trial #1 Trial #2 Trial #3 5.00 mlL 25,00 mL Volume of standard Ca2 2. mL 17.00 mL Final buret reading mL mL 3. O00 mL OO0 mL Initial buret reading 4. mL 00 mL Volume of EDTA used 5. mL mL 6 Molarity of EDTA (Show set-up) М as.oomLcax 8.00 10 I mol EDta mol X 2DXIO mol EDta Imolca 1000ML 4 a.ox 10mof Eota .O17 00 L 4 2.0x10maP Da .0 1o00 7 Average molarity of EDTA М 165 MA

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Answer 1

one of standard ca 2+ = 8x101 M Trial of EDTA M, V M, X 17 2) Mi u/ std. Ca 2+ = M2 V₂ = 8X10°3 x 25 = 8X10 3 x 25 0.0117 M. Trial O2 Mivi z M₂ V₂ → Mix 16 = 8 X10-3 X25 & M = 8 x 10²3x25 16 Average Molarity & Mit Mil - VOEDIO J 2 0.0125 M. 0.01213 m Trial of EDTA VS Water sample. MiVa M₂V₂ 0.01213 x 14.70 - M X 25 » Molarity of Cazt = 0.0213X 14.70 -0.00713 25 = 7.13x10 3 M Trial 02 » » M, V = M₂ U₂ 0.0213 X 10.5 = M2 x 25 Molarity of Caht = 0.01213 X 10.5 25 - = 5.098103 M Trial O3 MINI = M₂ V 2 2 0.0213 x 18 = M₂ x 25 » Molarity of Ca2+ = 0.01213 X 18 2 25 Average cone of cat in sample 6.983 * 103 M. 8-73 X 10²4

Date Page concentration of caco = 6.983 X 103 M Ima (1) 11 q sample contains a 6.983 10-3 ma. = 6.983 X 103 mol x 100 gmot! = 0.6983 g = 698.3 mg - cone of CaCO3 = 698.3 mg l" . 1 dear I hardness is defined as 10 mg of cat? per litre of water & degree of hardness = 69.8