For the last-named purpose it is sometimes replaced by sodium chlorate.
This has indeed become the principal, because it is the cheapest, process for the manufacture of potassium and sodium chlorate.
The modern process consists in the electrolysis of a hot solution of potassium chloride, or, preferably, the formation of sodium chlorate by the electrolytic method and its subsequent decomposition by potassium chloride.
Further, certain cubic crystals, such as sodium chlorate and bromate, and also some liquids and even vapours, rotate the plane of polarization of the light that traverses them, whatever may be the direction of the stream.
The area must be kept weed and litter free, but do not use sodium chlorate weedkiller.
