## Question

###### A solutioncontains 7.69Ã—10-3 M potassiumsulfide and 7.65Ã—10-3 M ammoniumcarbonate.Solid cobalt(II) acetate is added slowlyto this mixture.A. What isthe formula of the substance thatprecipitates first?formula = _________B. What isthe concentration of cobalt(II) ion whenthis precipitation first begins?[Co2+] = _________ M

A solution contains 7.69Ã—10-3 M potassium sulfide and 7.65Ã—10-3 M ammonium carbonate. Solid cobalt(II) acetate 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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