A student pipets 50.0 mL of a 0.200 M aqueous potassium nitrate solution into a beaker
CHEMISTRY · Multi-part · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures
Problem
A student pipets 50.0 mL of a 0.200 M aqueous potassium nitrate solution into a beaker. The student then adds 25.0 mL of distilled water and stirs thoroughly. Next, the student removes exactly 10.0 mL of this diluted solution and transfers it into a clean test tube, where an additional 5.0 mL of water is added.
Respond to the following.
(a) Determine the molarity of potassium nitrate in the beaker immediately after the first addition of 25.0 mL of water.
(b) Calculate the molarity of potassium nitrate in the test tube after the subsequent addition of 5.0 mL of water.
(c) The student wants a single-step procedure that would yield exactly 15.0 mL of a 0.0500 M potassium nitrate solution starting from the original 0.200 M stock. Describe the procedure and justify quantitatively that it will achieve the desired concentration.