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.
Depending on the nature of your surgery, about a week before hand. Pre-op assessments for day surgery are valid for 6 weeks as long as there's no change in condition, and 4 weeks for in-patient.This is a national guideline. You should already have a date, which the nurse will confirm with you at your pre-assessment.eport Abuse. Depending on the nature of your surgery, about a week before hand. Pre-op assessments for day surgery are valid for 6 weeks as long as there's no change in condition, and 4 weeks for in-patient. This is a national guideline.