[Mimic]

In 500 ml of a Co(OH)₂ saturated solution (Kps = 1.6*10^-18) are introduced 0.1 mol of NH₃ and 0.3 mol of NH₄Cl. The constant of ammonia dissociation is 1.8*10^-5: what is the amount by weight of hydroxide which precipitates?

Can you help me?

Thanks in advance

[AWK]

1. Calculate solubility of cobalt(II) hydroxide in water.
2. Calculate concentration of OH^- in buffer solution.
3. Calculate solubility cobalt(II) hydroxide at this concentration of OH^-.
4. Calculate difference of solubilities (expressed in molar concentrations), convert it to mass of cobalt(II) hydroxide and scale down to 500 ml.

[Vidya]

Start to solve it as advised by AWK
We will help you as you wherever you need help.

[Mimic]

[AWK]

what is the amount by weight of hydroxide which precipitates?

[Mimic]