LIST: Sodium carbonate. Calcium carbonate. Zinc sulfate. Zinc nitrate.
(a) State a pair of chemicals from the list above that can be used to prepare zinc carbonate by a precipitation reaction involving mixing 2 aqueous solutions together.
(b) Write a chemical equation reaction in (a).
(c)How would you obtain a pure,dry samples of lead(II) carbonate from the mixture of solution in (a)?
~Please Help~
(a) To prepare zinc carbonate by a precipitation reaction involving mixing two aqueous solutions together, we need to find a pair of chemicals from the given list that can react to form zinc carbonate.
Looking at the list, we see that zinc sulfate (ZnSO4) is an aqueous solution and sodium carbonate (Na2CO3) is also an aqueous solution. These two chemicals can react together to form zinc carbonate (ZnCO3) precipitate.
(b) The chemical equation for the precipitation reaction between zinc sulfate and sodium carbonate can be written as follows:
ZnSO4(aq) + Na2CO3(aq) → ZnCO3(s) + Na2SO4(aq)
In this equation, the aqueous solutions of zinc sulfate and sodium carbonate are mixed, resulting in the formation of a precipitate (solid) of zinc carbonate and a soluble salt, sodium sulfate, in the remaining solution.
(c) To obtain a pure, dry sample of lead(II) carbonate from the mixture of solutions in (a), the following steps can be followed:
1. Filter: Use a filter paper and a funnel to separate the solution from the precipitate. The precipitate, which is the lead(II) carbonate, will be retained on the filter paper, while the remaining solution will pass through.
2. Wash: Carefully wash the precipitate on the filter paper with distilled water to remove any impurities or remaining soluble salts. Swirl the filter paper with the precipitate in a beaker of distilled water, then carefully pour off the water. Repeat this washing process several times.
3. Dry: Once the precipitate is washed, transfer the filter paper along with the lead(II) carbonate precipitate to a watch glass or clean, dry surface. Allow it to air dry in a well-ventilated area. Alternatively, you can gently warm the precipitate on a watch glass or in an oven at a low temperature to speed up the drying process.
After drying, you will have a pure, dry sample of lead(II) carbonate ready for further analysis or use.