Chemical Industry-Sodium phosphates

Caustic soda is used industrially to produce sodium phosphate salts.  The different forms of these salts as monosodium phosphate, disodium phosphate and sodium tripolyphosphate are obtained by neutralization of phosphoric acid with soda ash or caustic soda.

All salts can be produced with either caustic soda or soda ash except trisodium salt.

Because the basicity of soda ash is insuficient, the trisodium phosphate form must be obtain with caustic soda.

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