Describe the salt making process used to make zinc sulfate?
Answers
Answer:
The method comprises the following steps: (1) zinc sulfate is prepared through a synthesis reaction, wherein a sulfuric acid solution is added in a glass beaker; zinc particles are slowly added until a pH value is 5; when a reaction is finished, the solution is heated to a temperature of 85 DEG C, such that a solution
Answer:
Zinc sulfate is a complex fertiliser. This simple salt is a source of the micronutrient zinc and the
secondary nutrient sulfur. However, it is as a source of zinc that it is important.
Zinc sulfate is produced by reacting zinc carbonate with sulfuric acid:
ZnCO3(s) + H2SO4(aq) ZnSO4(aq) + H2O(l) + CO2(g)
Zinc sulfate used for pharmaceutical preparations is made from the reaction of sulfuric acid with
high purity zinc oxide:
ZnO(s) + H2SO4(aq) ZnSO4(aq) + H2O(l)
Zinc sulfate crystallises from aqueous solution as a heptahydrate, zinc sulfate-7-water,
ZnSO4.7H2O.
You can make zinc sulfate-7-water in the laboratory by reacting zinc carbonate with dilute sulfuric
acid.
Equipment and materials
• Weighing bottle (or small beaker)
• 250 cm3 beaker
• Bunsen burner, tripod and gauze
• 25 cm3 measuring cylinder
• Hot water bath
• Filter funnel and filter paper
• Thermometer (0 – 110 °C)
• Evaporating basin
• Spatula
• Sample bottle
• 1 mol dm−3 sulfuric acid
• Small granules of zinc carbonate
Method
Care: Wear eye protection. 1 mol dm−3 sulfuric acid is an irritant.
1. Weigh out about 3.5 g of zinc carbonate into a weighing bottle or small beaker.
2. Using a measuring cylinder, measure out 25 cm3 of 1.0 mol dm−3 sulfuric acid into a 250 cm3
beaker.
3. Use a spatula to add zinc carbonate to the acid. Add the solid a little at a time, stirring between
additions and allowing any effervescence to die away before adding more.
4. Filter the solution into an evaporating basin. This removes any unreacted zinc carbonate from
the mixture.
5. Put the evaporating basin on a tripod and gauze. Slowly evaporate the solution until it is about
one-fifth of its original volume. Caution: Do not boil the solution as it may spit.
6. Allow the concentrated solution to cool until crystals form.
7. Filter off the crystals and put the filter paper and crystals on a watch glass and dab dry with
another piece of filter paper. Cover them with a piece of clean filter paper and leave them to dry
at room temperature.2
8. Label a sample tube with the name of the product, your name and the date. Weigh the labelled
sample tube and record its mass.
9. Tip your dry product into the sample tube. Weigh the tube again. Record its mass.
Calculations
You used an excess of zinc carbonate and so the theoretical yield depends on the volume of 1 mol
dm−3 sulfuric acid used.
Calculate
1. the theoretical yield of zinc sulfate-7-water;
2. the percentage yield of zinc sulfate-7-water
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