You have just spilled part of a bottle of 0.5 m edta. you measure the remaining amount and find out you still have 150 ml left. you are wondering whether you'll have enough for an extraction you're about to run. calculate how many moles of edta you have left.

0.075 moles of EDTA are left.

Explanation:

To solve this problem we need to use the definition of Molar concentration (M):

M=

With that equation in mind, in the problem we're given two out of the three factors: Concentration and Volume. We're asked to calculate the remaining factor.

Before we calculate we convert 150 mL to L, so we divide 150 by 1000.

Lastly we calculate the number of moles of EDTA left:

0.5 M * 0.150 L = 0.075 moles.