Specific Process Knowledge/Wafer cleaning/7-up & Piranha: Difference between revisions

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 |80 <sup>o</sup>C
 |80 <sup>o</sup>C
-|~70 <sup>o</sup>C the chemicals will heat up to working temperature during mixing, '''therefore be careful!''' First ad H<sub>2</sub>SO<sub>4</sub> then H<sub>2</sub>O<sub>2</sub>{{fn|1}}
+|~70 <sup>o</sup>C the chemicals will heat up to working temperature during mixing, '''therefore be careful!''' First ad H<sub>2</sub>SO<sub>4</sub> then H<sub>2</sub>O<sub>2</sub><sup>{{fn|1}}</sup>
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-{{fnb|1}} In preparing a solution involving an acid, always add the acid last. The exception to this rule is Piranha, in which case you add hydrogen peroxide (H2O2), a very strong base, to sulfuric acid (H2SO4), a very strong acid. Why? Because it is potentially explosive and at the very least will cause the solution to become very warm. Picking up a beaker that is this hot will be very painful, might melt your gloves, and may cause you to spill it.
+{{fnb|1}} In preparing a solution involving an acid, always add the acid last. The exception to this rule is Piranha, in which case you add H<sub>2</sub>O<sub>2</sub>, which is a very strong base, to H<sub>2</sub>SO<sub>4</sub>, which is a very strong acid. This is done because it is potentially explosive and at the very least will cause the solution to become very warm.