Proceedings of the Annual Convention 5

Cover Proceedings of the Annual Convention 5
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By his process Clarke removed the lime and mag- nesia carbonates from hard water by adding to the hard water the proper amount of slaked lime required to combine with the carbonic acid that held them in solution. Some years later Porter suggested the use of carbonate of soda for decomposing the lime and magnesia sulphates.
The Clarke-Porter process is the basis of practically all of the commer- cially successful water-softening plants that are in use at the present time. The chemical principles
... involved are simple.
ANALYTICAL.
To precipitate lime and magnesia carbonates from hard water it is only necessary to remove from the water the carbonic acid gas that holds them in solution. Common slaked lime is the cheapest known chemical that will do this and not leave any by-product in the water.
To precipitate lime and magnesia sulphates from' hard water it is necessary to decompose them. Carbonate of soda, commercially known as soda ash, is the cheapest known chemical that will do this. It leaves dissolved in the water as a by-product sulphate of soda.


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