Question

why is the reaction between potassium and dilute acids not used in laboratory to prepare hydrogen?

Answer 1

The reaction between potassium and a dilute acid or even just water (which is what an acid is diluted in) is very dangerous. On contact with the acid the potassium bursts into flame and may even explode, sending flaming molten pieces of potassium into the air. all we know that the hydrogen is very reactive guess so this things are not used in laboratory