Data and Calculations: Determination of the Hardness of Water Mass of beaker plu
ID: 1086857 • Letter: D
Question
Data and Calculations: Determination of the Hardness of Water Mass of beaker plus CaCO, Volume Ca 17.2224g solution prepared 250ml Mass of beaker less sample 16. 9542 0 2656 002652 moles 2Molarity of 0.00 2333M 0265 33/0.25 Mass of CaCO, sample Moles Ca in each aliquot titrated -0.010613 moles g Number of moles CaCO, in sample (Formula mass 100.1) Standardization of EDTA Solution Determination of blank: Initial buret reading resding realing 35 04 nnk o9 al. Final buret reading S0 mL mL blank Titration Initial buret reading Final buret reading .0 mL 31,5 mL 305 mL 29.5 m mL mL mL. 20.mL 29,5 Volume of EDTA Volume EDTA used to titrate blank mL mL. mL Volume EDTA used to mL 26,6 ml 25, GQ ml titrate Ca2. Average volume of EDTA required to titrate Ca? Molarity of EDTA- no. moles Ca2+ in aliquot X 1000 261-mL average volume ED'TA required (mL continued on following page)Explanation / Answer
Titration I:
The volume of EDTA to titrate 50 mL of water = 11.3 mL
Therefore, to titrate 1 L (= 1000 mL) of water, the volume of EDTA required = 1000*11.3/50 = 226 mL
Titration II:
The volume of EDTA to titrate 50 mL of water = 10.9 mL
Therefore, to titrate 1 L (= 1000 mL) of water, the volume of EDTA required = 1000*10.9/50 = 218 mL
Hence, the average volume of EDTA per liter of water = (226 + 218) mL/2 = 222 mL
No. of moles of EDTA per liter water = 0.0026533 mol = no. of moles of CaCO3 per liter water
1 ppm = 1 mg/L
The mass of CaCO3 per liter water = 0.2656 g = 0.2656*103 mg = 265.6 mg
Therefore, the hardness of water = 265.6 ppm CaCO3
Note: If you have any further doubts, please be sure to get clarified, all the best!
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.