This page provides basic problems involving molarity calculations. When you press the "New Problem" button, two of the cells will fill. Determine the value of the missing quantity, enter it in the empty cell and press "Check Answer". The results are displayed in the second table, which will also keep a running total of your score. If you get a question wrong, you can reenter and recheck your answer. Getting new problems is just a matter of pressing the "New Problem" button at any time.