What happens if sodium sulfide is added to iron(II) sulfide? [Fe^2+] increases and [S^2] decreases because sulfide is a common ion. [Fe^2+]

What happens if sodium sulfide is added to iron(II) sulfide?

[Fe^2+] increases and [S^2] decreases because sulfide is a common ion.
[Fe^2+] decreases and [S^2] increases because sodium is a common ion.
[Fe^2+] and [S^2] remain the same because sodium is not a common ion.
[Fe^2+] decreases and [S^2] increases because sulfide is a common ion.

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