How to calculate moles and total moles?

calculate Ca2+ moles in 10mL hard water sample and ppm


i have an EDTA moles of 0.1000M.


do i calculate this by saying (0.01L)(0.1000M)


but i also have a titre value, of 9.70. where does that go or does it ?





secondly i have to calculate total moles of Mg2+ and Ca2+ in the 10ml hard water sample: how do i do this: i know there is a 1:1 ration. do i use the m1v1=m2v2


m1 whatever the calcium is? and v1 would it be the tire? and the v2 would that be the 10ml?


not sure?

How to calculate moles and total moles?
You haven't explained the details clear enough to be able to help. I'm not sure you really understand the experiment yourself, I have a feeling you may have just "cook booked it" and are now trying to figure out what to do with the values that you got.





The experiment involves complexing EDTA with Ca+2, and Mg+2 in tap water. You are given a standardized solution of EDTA - so you don't even have to worry about having to figure out the concentration of this solution - it is known - all you have to do is know how much EDTA you titrated into the samples to complex the Ca+2 and Mg+2 and then figure out based on the volume of EDTA used how much Ca+2 and Mg+2 must have been present.





The second part is just a dilution factor, if you had 10 ml of a solution and diluted it to 1000 ml ( or 100ml) then you would adjust your dilution value by 10/1000 (10/100) accordingly. The moles of Ca and Mg in the solution stay the SAME - it's just they are more diluted! - do you see the difference?