Homework Help: 10th grade chemistry

Posted by ceedub on Sunday, March 8, 2009 at 1:05pm.

We're doing a lab report on the hardness of water, and one of the calculations is
"The EDTA reacts with the hard water ions in a 1:1 mole ratio. Calculate the molarity of the ions present in 20 mL of water tested."
How would you do this?

10th grade chemistry - xola james, Thursday, March 19, 2009 at 8:36am
volume and mass
10th grade chemistry - Emma, Thursday, April 30, 2009 at 11:01pm
A weather ballon with a 2 meter diameter at ambient temperature holds 525 grams of helium. What type of electronic probe could be used to determine the pressure inside the balloon?

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