Metal Chloride + Acid

[ahat]

If a metal chloride is reacted with hydrochloric acid, is n(HCl) = 2 n(metal **chloride salt) for all situations?

[adianadiadi]

Usually it is 1equiv HCl = 1equiv carbonate

In terms of moles it is 1 mole HCl = 1/2 mole CO3^2-

[lzxnl]

If a metal chloride is reacted with hydrochloric acid, is n(HCl) = 2 n(metal carbonate) for all situations?

Wait what? If you react a metal chloride with hydrochloric acid...you get a solution of acid, metal ions and even more chloride ions...unless we're speaking some really reactive metal cation like Au+...

If you mean carbonate, then n(HCl)=2n(CO₃^2-) only when the acid completely reacts with all of the carbonate. If not, you get issues with some HCO₃^- forming.

[ahat]

What I mean, for example:

Mg(s) + 2HCl(aq) ---> MgCl₂(aq) + H₂(g)

I was wondering if *shoot, I just realised I said metal chloride instead of metal salt in my question*
n(HCl):n(MgCl) - or whatever salt it is
is     2:1
in all cases?

(and I just realised I said carbonate at the start - fixed)

[SocialRhubarb]

Depends on the oxidation state of the metal.

Mg forms a 2+ cation, so the ratio of HCl to Mg is 2:1.

[ahat]

Depends on the oxidation state of the metal.

Mg forms a 2+ cation, so the ratio of HCl to Mg is 2:1.

Rightttt, of course. The notion just came to me because 2:1 ratio was all I ever saw.