Alkalizing agents sodium hydroxide

The formyl derivative is then hydrolyzed by refluxing with 50% sulfuric acid for about 4 hours, after which the hydrolysate is extracted with ether to remove the acid-insoluble material and the aqueous solution made strongly alkaline with any suitable alkalizing agent, for example, sodium hydroxide, to liberate the amine. 

Phosphate need not be used in boilers where hardness can be eliminated from the FW at all times. Its use is not recommended for boilers that may exhibit severe hideout (see the section on coordinated phosphate treatment). In these circumstances, sodium hydroxide is the preferred alkalizing agent and should be dosed to a maximum of 1.5x the sodium chloride content. 

Samples taken from water containing no oxidizing agents are first neutralized against phenolphthalein by adding 1 m hydrochloric acid or 1 m sodium hydroxide, and then slightly alkalized by adding 1 ml of 1 m sodium hydroxide for every litre of the sample. 

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