A solution contains 1.13Ã10^-2 M sodium carbonate and 1.18Ã10^-2 M ammonium sulfide.
Solid cobalt(II) nitrate is added slowly to this mixture.

A. What is the formula of the substance that precipitates first?

formula =

B. What is the concentration of cobalt(II) ion when this precipitation first begins?
[Co²⁺] = ______ M

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