If we drop sodium in water it burns why its so. If its burns then why it blast and spread everywhere why?

Dear student,

When we drop the Sodium in water the hydrogen gas is  evolved in the reaction which is combustible gas.
 This reaction is  exothermic therefore evolved hydrogen gas  catches the fire. This reaction can be written as,

Na (s) +H2O (liq.) → NaOH (aq) + H2 (g) +heat

When water reacts with the metal ion the metal rapidly release  electrons. And the negatively charged electrons generate heat as soon as  they leave the metal. 



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