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Hardness of water? Please, I need some HELP!!!? 25-ml aliquots of a solution (0.5215- CaCO3 is dissolved in 12M HCL and the resulting solution is diluted to 250 ml.) are titrated with EDTA to the Eriochrome Black T end point. A blank containing a small measured amount of Mg2+ requires 2.60 ml of the EDTA to reach the end point. An aliquot to which the same amount of Mg2+ is added requires 28.55 ml of the EDTA to reach the end point. 1. How many ml of EDTA are needed to titrate the Ca2+ ion in the aliquot? 2. How many moles of EDTA are there in the volume obtainedin part 1? 3. What is the molarity of the EDTA solution? A 100-ml sample of hard water is titrated with EDTA solutionin problem 1. The same amount of Mg2+ is added as previously and the volume of EDTA required is 22.44 ml 1. What volume of EDTA is used in titrating the Ca2+ in the hard water? 2. How many moles of EDTA are there in that volume? 3. How many moles of Ca2+ are there in the 100ml of water? 4. If the Ca2+ comes from CaCO3 how many moles of CaCO3 are there in one L of the water? How many grams of CaCO3 per L? 5. If 1ppm CaCO3=1mg per L what is the water hardness in ppm CaCO3?

By: Guest
Date: Thu-Dec-17-2009-
Response
0

[d] By: Guest
Date: Unknown---
Response
What is 1 + 100



Helpfulbox Now Offers Free POS Software

for restaurants, kiosk, and any other retails business completely free. It can be used as windows cashier system or as full blown POS. You will able to print to kitchen, display orders on the kitchen screen, manage inventory, employee, report, customer loyalty offers, employee management, delivery address track and much more, all for free.

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