A chemist prepares a solution by adding 293 mgmg of K2Cr2O7K2Cr2O7 (MWMW = 294.19 g/molg/mol ) to a volumetric flask, and then adding water until the total volume of the contents of the flask reaches the calibration line that indicates 250 mLmL . Determine the molarity of the prepared solution.

The molarity of solution will be 0.00325 M

Explanation:

Molarity : It is defined as the number of moles of solute present per liter of the solution.

Formula used :

where,

n= moles of solute =

given mass = 239 mg = 0.239 g  (1g=1000mg)

moles of

= volume of solution in ml = 250 ml

Now put all the given values in the formula of molarity, we get

Therefore, the molarity of solution will be 0.00325 M