# What is the formula for copper (l) sulfide?

May 26, 2018

$\text{Copper(I) sulfide"-="cuprous sulfide} \equiv C {u}_{2} S$

#### Explanation:

Copper metal can access two common oxidation states, i.e. $C {u}^{+}$ or $C {u}^{2 +}$:

${\underbrace{C {u}_{2} S}}_{\text{copper(I) sulfide or cuprous sulfide}}$;

${\underbrace{C u S}}_{\text{copper(II) sulfide or cupric sulfide}}$.

As are most sulfide salts, both salts would be as soluble as bricks in aqueous solution, and are poorly characterizable...