[_lynx_]

I know that Metal +acid gives a salt +hydrogen,

but according to my revision guide when you react

Copper + Concentrated sulphuric acid==== Copper sulphate+ Water+ sulphur dioxide

I doubt it was an error in the revision guide, but is this a set rule for when you react a metal with concentrated acid?

Thanks in advance for any help

[_lynx_]

No worries, i've got conformation on this matter. Apparently, when you add a metal to concentrated sulphuric acid or warm sulphuric acid, you will get sulphur dioxide and water produced.

[charco]

Originally Posted by _lynx_

No worries, i've got conformation on this matter. Apparently, when you add a metal to concentrated sulphuric acid or warm sulphuric acid, you will get sulphur dioxide and water produced.

Some strong acids can behave as oxidising agents, eg sulphuric and nitric acid. As metals are reducing agents they can be oxidised by these acids to produce salts and the acid is consequently reduced to lower oxidation state compounds, usually oxides.

Nitric acid is the common example of this kind of behaviour and can behave as an oxidising agent when not concentrated. Sulphuric acid must be concentrated and hot with unreactive metals and certain non-metals such as carbon and sulphur.

example:

2H₂SO₄ + C --> CO₂ + 2SO₂ + 2H₂O

[_lynx_]

Originally Posted by charco

Some strong acids can behave as oxidising agents, eg sulphuric and nitric acid. As metals are reducing agents they can be oxidised by these acids to produce salts and the acid is consequently reduced to lower oxidation state compounds, usually oxides.

Nitric acid is the common example of this kind of behaviour and can behave as an oxidising agent when not concentrated. Sulphuric acid must be concentrated and hot with unreactive metals and certain non-metals such as carbon and sulphur.

example:

2H₂SO₄ + C --> CO₂ + 2SO₂ + 2H₂O

Thanks for the indepth explanation! Much appreciated.