When a spill of an unknown corrosive liquid occurs, what is the primary action to be taken immediately after initial containment to mitigate the hazard before further assessment?

The primary action to be taken immediately after initial containment of an unknown corrosive liquid spill, to mitigate the hazard before further assessment, is to neutralize the corrosive substance. Neutralization is the process of chemically altering a corrosive substance to make it less harmful. Corrosive liquids are substances that can damage or destroy other materials, including skin and eyes, through a chemical reaction. For acids, a weak base such as sodium bicarbonate (baking soda) is used for neutralization. For bases, a weak acid such as citric acid is used. This process reduces the reactivity of the spill, making it safer to handle during subsequent cleanup and assessment. It is crucial to use the correct neutralizer because using the wrong one can create a more dangerous situation or fail to mitigate the hazard.