Which equation would describe the following equilibrium constant?

Kc = [Bi3+]2[S2-]3
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Bi2S3 (s) <-> 2Bi3+ (aq) + 3S2- (aq)
Bi2S3 (s) + 6HCl (aq) <-> 2BiCl3 (aq) + 3H2S (aq)
BiS (s) <-> Bi3+ (aq) + S2- (aq)
Bi2S3 (s) <-> 3Bi2+ (aq) + 2S- (aq)

2 answers

Bi2S3 (s) <-> 2Bi3+ (aq) + 3S2- (aq)
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