Question

sodium reacts with water less vigorously than potassium explain

Answer 1

sodium reacts with less vigorously than potassium because potassium is more reactive in nature than sodium and it comes on first in the reactivity series and then comes the sodium

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Answer 2

potassium reacts violently with water, producing hydrogen. The reaction is notably more violent than that of lithium or sodium with water, and is sufficiently exothermic that the evolved hydrogen gas ignites. 

2K(s) + 2H2O(l) → H2(g) + 2KOH(aq) 
Because potassium reacts quickly with even traces of water, and its reaction products are nonvolatile, it is sometimes used alone, or as NaK (an alloy with sodium which is liquid at room temperature) to dry solvents prior to distillation. In this role, it serves as a potent desiccant. 

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