Question

total volume of 500 . mL In the laboratory you dissolve 18.1 g of ammonium phosphate in a volumetric flask and add water to What is the molarity of the solution? M

Answer 1

In the laboratory 18.1 grams of ammonium phosphate is dissolved in 500 mL of water.

Thus the weight of ammonium phosphate is 18.1 grams

Volume of solution is 500 mL

We have the molecular mass of ammonium phosphate = 149 g/mol

Molarity of the solution can be calculated from the formula

Molarity = (Weight / Molar mass) (1000 / Volume of solution in mL)

Therefore the molarity of ammonium phosphate

= (18.1 g /149 g/mol) (1000 mL /500 mL)

= (18.1x2)/149 = 0.24295 M

Thus the required molarity of ammonium phosphate is 0.24295 M.