Question

An experiment in chm 2045 requires students to prepare a 1.0 M aqueous solution of potassium phosphate.Jennifer fills a 1.0 liter volumetric flask to the calibration line with water. She then weighs out 212.3 g of potassium phosphate and adds it to the volumetric flask.Joe weighs out 212.3 g of potassium phosphate and adds it to a 1.0 liter volumetric flask. He then fills the volumetric flask to the calibration line with water.Which student has correctly prepared a 1.0 M aqueous solution of potassium phosphate?

Answer 1

Answer:

Joe correctly prepared the solution.

Explanation:

When comparing both methods, we see that the mass of potassium phosphate weighed is the same for Jennifer and Joe, so that's not a factor.

The difference lies in the fact that Jennifer added the solid to 1.0 liters of water, so the final volume is higher than 1.0 L, that's why the concentration will be lower than 1.0 M.

The final volume of Joe's solution is 1.0 L, that's why he prepared the solution correctly.