ASNT Level III- Visual & Optical Testing
My Level III Self Study Notes Reading 4 Section 4B
My Level III Self Study Notes Reading 4 Section 4B
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7.3.4 Generation of Heat<br />
Heat may be generated when chemicals are mixed<br />
together or added to water. Mixing chemicals must be done<br />
using accepted laboratory procedures and caution. Strong<br />
acids, alkalis or their concentrated solutions incorrectly<br />
add to water, alcohols or other solutions, cause violent<br />
chemical reactions. To be safe, never add water to concentrated<br />
acids or alkalis. In general, the addition of acidic materials to alkaline<br />
materials will generate heat. Sulfuric acid, sodium hydroxide<br />
or potassium hydroxide in any concentration generate large<br />
amounts of heat when mixed or diluted and an ice bath may<br />
be necessary to provide cooling. Three precautions in mixing<br />
can reduce or prevent a violent reaction:<br />
Keywords:<br />
To be safe, never add water to concentrated acids or alkalis.<br />
Charlie Chong/ Fion Zhang