# Reacting sodium metal with aqueous sodium hydroxide, what would happen?

I know sodium metal, when reacted with water, produces flammable hydrogen gas but I was wondering if that would also be the case if I had aqueous 1M sodium hydroxide?

Would this reaction be safe or will it also produce a harmful compound like hydrogen gas?

• Yes, the sodium metal will react with the water to produce more sodium hydroxide and hydrogen (gas)... until there is no water left to react with. – Ben Welborn Aug 12 '16 at 18:42
• ok, so will the sodium metal be consumed? And how fast would that be? – user510 Aug 13 '16 at 3:45
• 1M aqueous sodium hydroxide is no different from water in this regard. – Ivan Neretin Aug 13 '16 at 8:49
• Follow up question that (to me at least) is slightly less easy to answer: what if you react molten sodium metal with molten "anhydrous" sodium hydroxide? Do you get sodium oxide and hydrogen? – Curt F. Jan 6 '17 at 20:32

Sodium metal reacting with aqueous sodium hydroxide will continue to react, producing hydrogen ($\ce{H2}$) and sodium hydroxide ($\ce{NaOH}$). Eventually, however, the solution will become saturated with sodium hydroxide and the $\ce{NaOH}$ produced will form a coating on the outside of the sodium, preventing further reaction from occurring.

• > Eventually, however, the solution will become saturated with sodium hydroxide and the NaOHNaOH produced will form a coating on the outside of the sodium, preventing further reaction from occurring. || sodium gladly reacts with sodium hydroxide at elevated temperature. Furthermore, 'saturated' aqueous solution for sodium hydroxide is 1:1 molar mixture. – permeakra Aug 13 '16 at 12:04
• @permeakra I didn't know this before. What product will the reaction make, as a matter of interest? – sadljkfhalskdjfh Aug 13 '16 at 12:11
• Sodium hydride and sodium oxide. – permeakra Aug 13 '16 at 12:27
• what about room temperature, then it will follow what you said of coating or will there be a totally different reaction? – user510 Aug 13 '16 at 15:22