Solution A | Solution B | Does a precipitate form when A & B are mixed | Empirical formula of precipitate |
Potassium Sulfide | Cu(II) nitrate | Yes O No | CuS |
Sodium Hydroxide | Magnesium Bromide | Yes O No | Mg(OH) 2 |
Zinc nitrate | Iron (II) chloride | O Yes No |
We can use solubility table to solve this problem.
Consider a reactions.
1) K2S + Cu(NO3)2 CuS + KNO3
Product KNO3 is alkali metal nitrate and it is soluble in water.
Product CuS is insoluble in water, hence it precipitates out.
2) 2 NaOH + MgBr 2 Mg(OH) 2 + 2 NaBr
Product NaBr is water soluble.
Product Mg(OH) 2 is insoluble in water, hence it precipitates out.
3) Zn(NO3) 2 + FeCl 2 Fe(NO3) 2 + ZnCl 2
Both products are water soluble. Hence no precipitate forms.
Both products are actually present in the form of ions in the solution, hence it is assumed that there is no reaction. Hence, equation is Zn(NO3) 2 + FeCl 2 No reaction.
solution A solution B Does a precipitate form when A and B are mixed? empirical formula...
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