Solvay G!

What is the most improtant product of the Solvay Process

• sodium hydrogen carbonate

• ammonia

• sodium carbonate

• calcium chloride

Whys is calcium chloride considered a waste

• It has no uses at all

• It has to be disposed of

• It can't be recylced in the Solvay product

• Too much is produced for the Australian market

Wastes produced in the Solvay Process include:

• ammonia, calcium chloride

• heat, calcium chloride

• ammonia, heat

• only calcium chloride

Which chemical associated with the Solvay process can be used as a drying agent and for de-icing roads

• ammonia

• brine

• calcium chloride

• calcium carbonate

Which is the best justification for dumping calcium chloride waste into the ocean

• Carbonate ions in the ocean can remove excess calcium ions and hydrogen carbonate deals with residual alkali in the waste

• The oceans naturally contain calcium and chloride ions and the amount of waste dumped does not greatly alter their concentrations

• It is convenient

• It is cheaper than evaporating to dryness and burying

Which ions need to be removed from brine in order to purify it?

• sodium and magnesium

• calcium and sodium

• magnesium and calcium

• sodium magnesium and calcium

Ammonia may be lost from the Solvay plant due to leaks in the

• ammonia saturator and ammonia recovery unit

• ammonia saturator, ammonia recovery unit and carbonating tower

• nowhere as it is monitored closely

• only the ammonia saturator as this is where the greatest pressure of ammonia is needed

Which of the following are not uses of sodium carbonate

• glass making and making fertilisers

• making baking soda and soap

• making paper and removing sulfur dioxide from flu gases in power stations

• treating water and replacing sodium hydroxide in industrial processes

The reason why waste heat is produced in the Solvay Process is

• the overall process in close to thermally neutral (Delta H approx 0)

• Some of the steps in the process are exothermic

• The Solvay process is endothermic - large amounts of heat are used in the lime kiln and the ammonia recovery tower

• It is not possible to capture all of the heat produced in the Solvay Process and use it for the endothemic reactions involved

Both carbonate and hydroxide ions are used to purify brine because

• calcium carbonate is slightly soluble while calcium hydroxide is not

• magensium carbonate is slightly soluble while magnsium hydroxide hydroxide is not

• calcium carbonate is insoluble while magnesium hydroxide is soluble

• Calcium carbonate and magesium hydroxide are insoluble