Lithium, sodium, and potassium all react with water. What might you observe when each of these metals reacts with water?
A fizz and a bang and a pop.
Lithium will be the least reactive of the metals, but the reaction will still be quite vigorous. Sodium will be a little bit more active. With potassium, you might see a few flames. If a little phenolphthalein had been added to the water solution (phenolphthalein is a good acid base indicator whose basic form is pink!) what would you expect to see?