Base+Disposal

=__Base Neutralization__= =Facilities, Personal Protection and Equipment=
 * Carry out neutralizations in a well-ventilated fume hood
 * Use the sash or a safety shield for protection against vigorous reactions
 * Wear an apron, splash-proof goggles and a full-face shield and nitrile gloves (other glove material may not provide proper protection). Long gloves or gauntlets protect forearms from splashes.
 * A five-gallon polyethylene bucket is recommended for neutralizing 1 to 10 liters.
 * A large container is needed for addition of cold water / ice and base, and to safely stir the reaction.
 * Perform all steps SLOWLY.
 * **Caution**: Vapors and heat may be generated.
 * pH paper

Procedure
Can be used with solutions of potassium and sodium hydroxides and alcoholic sodium or potassium hydroxide cleaning solutions
 * 1) Follow Facilities, Personal Protection and Equipment for Neutralization and Planning For Neutralizations, above.
 * 2) Note that effervescence on addition of acid is common with older base solutions due to carbon dioxide absorption.
 * 3) Add up to 2 L hydroxide solution to 10 liters water.
 * 4) Slowly add 6 N hydrochloric or other suitable acid, but not concentrated sulfuric acid.
 * 5) Monitor pH changes with pH paper or phenol phthalene. Note: Universal indicators can air oxidize rapidly in basic solutions giving a false color change.
 * 6) When pH < 10 is reached, solution can be washed down sanitary sewer with a water rinse to clear the trap.