NaOH + Na2HPO4 --> Na3PO4 + H2O (aka tribasic sodium phosphate) Of course, once all the hydrogen is consumed there is no further reaction with sodium hydroxide. In general, adding sodium hydroxide to a solution of any of the sodium phosphates will change the pH.
Preoperative care. (Redirected from Pre-op) Preoperative care refers to health care provided before a surgical operation. The aim of preoperative care is to do whatever is right to increase the success of the surgery. At some point before the surgery the health care provider will assess the fitness of the person to have surgery.
a JustAnswer user. Pre' means before and' Pyloric' is the name of the valve on top of stomach. The pyloric valve functions as a trapdoor to keep food and gastric juices in the stomach. The esophagus (and mouth, which is part of the GI Tract) would be Pre-Pyloric. That's the definition. As to what it is referring to in YOUR case, I'm not 100% clear without additional information.