Is the answer to #3 (4.27×10^-4)? Do I have enough information? CHEM 163 Water H

Question

Is the answer to #3 (4.27×10^-4)? Do I have enough information?

CHEM 163 Water Hardness Post Lab: Water Hardness I Data Analysis: Suberact the awerage blank voluase from average primary sandad volume, show your work: o, 9533 mL. corrected primary standard volume 2. Determine the moles of Ca" ion in 2500 ml. using the molarity you caleulated in the data report. Show the work. Use three ee four significati figures, as appropriate. ns 4.27 klo Moles of Cal ion in each primary sample 4.a7x10 3 Determine the a moles of EDTA used, if it reacts 1:1 with calcium kn. Use three or far ignificant figures, as appropriate, H Moles of EDTA to titrate each Primary staadard and the heurecise milarity of the DTA stack sclution, using the aumber of moles, above, correct primary standard volume in I show the work. Use tirow or four significast

Explanation / Answer

The reaction occurred in 1:1 ratio thus the number of moles of Ca2+ are equal to the moles of EDTA.

Number of moles = molarity * volume in L

= 0.01708 moles / L * 25/1000 L

= 4.27*10^-4 Moles Ca2+ = EDTA

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