Calculate the mass (in grams) of methylene bluecrystals that you must weigh in order to make 100.0ml of 1.25 × 10-5mol/l methylene

The mass of methylene blue that must be weighed is

Explanation:

To calculate the mass of solute, we use the equation used to calculate the molarity of solution:

We are given:

Molarity of solution =

Molar mass of methylene blue = 319.85 g/mol

Volume of solution = 100.0 mL

Putting values in above equation, we get:

Hence, the mass of methylene blue that must be weighed is

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