# Reaction of a non-metal with alkali to produce hydrogen gas [closed]

I want to ask that is there any non-metal which reacts with an alkali (NOT alkali metal) to produce hydrogen gas?

## closed as off-topic by Todd Minehardt, Jon Custer, Klaus-Dieter Warzecha, F'x, WildcatAug 28 '16 at 10:46

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This is the extension of Alaska Ron's answer. All reactions taken from this site.

## Group 13 elements

All group 13 elements except indium and thallium reacts with aqueous alkali to produce a alkali salt and hydrogen. I'm taking the example of aluminium.

$$\ce{2Al + 2NaOH + 6H2O → 2Na[Al(OH)4] + 3H2}$$

$$\ce{2Al + 2(NaOH•H2O) ->[400-500°C] 2NaAlO2 + 3H2}$$

$$\ce{2Al + 6NaOH ->[450°C] 2NaAlO2 + 3H2 + 2Na2O}$$

$$\ce{2Al + 6H2O + 6NaOH → 2Na3[Al(OH)6] + 3H2}$$

## Group 14 elements

Silicon react with sodium hydroxide to produce sodium orthosilicate and hydrogen.

$$\ce{Si + 4NaOH → Na4SiO4 + 2H2}$$

Sodium hydroxide react with silicon and water to produce sodium silicate and hydrogen.

$$\ce{2NaOH + Si + H2O → Na2SiO3 + 2H2}$$

Tin and lead however forms a different product but eventually gives hydrogen gas. Lead only gives the first reaction.

$$\ce{Sn + NaOH + 2H2O → Na[Sn(OH)3] + H2}$$

$$\ce{Sn + 2NaOH + 2H2O → Na2[Sn(OH)4] + H2}$$

$$\ce{Sn + 2NaOH + 4H2O ->[\Delta] Na2[Sn(OH)6] + 2H2}$$

## Group 15 elements

Arsenic react with sodium hydroxide to produce sodium orthoarsenate and hydrogen.

$$\ce{As + 3NaOH ->[\Delta] Na3AsO3 + H2}$$

• thanks for these but I asked for reaction of a NON-metal with an alkali though these reactions will be helpful – Shinjinee Maiti Aug 22 '16 at 10:13
• @Shinjinee the above elements are all non-metal – Nilay Ghosh Aug 24 '16 at 10:51
• ?!? Al is a metal, as is tin unless you keep it in the cold for too long. – Karl Aug 27 '16 at 17:24
• @Karl, they are non metal in normal conditions. – Nilay Ghosh Dec 7 '16 at 17:13
• Who on earth told you that? Both are good conductors (esp. Al), ductile, have a silvery surface. Yes, neither is as perfectly a "metallic" element as sodium or iron, but to call them non-metals is utterly ridiculous. – Karl Dec 7 '16 at 23:16

Since you didn't say "aqueous", boron fused with sodium hydroxide produces hydrogen and sodium borate.

• This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post. - From Review – Klaus-Dieter Warzecha Aug 20 '16 at 5:53
• Um... boron is a non-metal, sodium hydroxide is an alkali and hydrogen... is hydrogen. How can this NOT be an answer to the question? – AlaskaRon Aug 20 '16 at 7:05
• However, if I'm really picky, I'd have to admit that boron is really a metalloid, and the real non-metals (halogens + O + N + C + P + S + Se) don't produce hydrogen when fused with sodium hydroxide. So if the OP means 'not a metal including metalloids' I'm ok... – AlaskaRon Aug 20 '16 at 7:19