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.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

chemistry sucks a**

explanation:

idk what the question is about