Chemistry
posted by Amber on .
Calculate the molarity of the nitrate ion in a 0.111 M solution of calcium nitrate?
so would I have to find the number of moles of (NO3)2 and then divide it by the 0.111 M to get the molarity of the nitrate ion I am so confused please explain the set up I don't want the answer just the steps to get the anser

You have 0.111M Ca(NO3)2. There are two mols NO3^ in 1 mole Ca(NO3)2. So.....

would i divide 0.111M by 2

No No NO.
there are two moles of nitrate ion for each mole of CalciumNitrate.
so if you started with .111moles calcium nitrate per liter, then you must have .222moles nitrate ion per liter. 
Amber, you were close. You don't divide though when there are 2:1 ratio... you multiply. On the other hand, if the ratio were 1:2 (one for every 2) then you would divide by 2. Hope this helps!