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Sodium reacts with water according to following reaction.
`2 Na + 2 H_2O ----gt 2 NaOH + H_2`
Sodium reacts highly with water and emits H_2 . The reaction is highly exothermic and you observe rise in temperature. The emitted H_2 will get burnt due to this heat release and burns with a bright flame. Hydrogen can sometimes give away tiny 'pop' sound of explosions.
During the reaction, NaOH is formed and it makes the solution alkaline. Since NaOH is a very strong base, it will make the univaersal indicator turn purple.
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