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Safety considerations are similar to those of sodium hydroxide. The caustic effects arise from being highly alkaline, but if potassium hydroxide is neutralised with a non-toxic acid then it becomes a non-toxic potassium salt. It is approved as a food additive under the code E525.
An example SDS, including guidance for handling a hazardous substance and information on its composition and properties. A safety data sheet (SDS), [1] material safety data sheet (MSDS), or product safety data sheet (PSDS) is a document that lists information relating to occupational safety and health for the use of various substances and products.
TMAH is preferred over sodium or potassium hydroxide in applications that are sensitive to metal ion contamination. [13] Typical etching temperatures are between 70 and 90 °C and typical concentrations are 5–25 wt.% TMAH in water. In case of (100) silicon etching rates generally increase with temperature and decrease with TMAH concentration.
In gold mining, KCN forms the water-soluble salt potassium gold cyanide (or gold potassium cyanide) and potassium hydroxide from gold metal in the presence of oxygen (usually from the surrounding air) and water: 4 Au + 8 KCN + O 2 + 2 H 2 O → 4 K[Au(CN) 2] + 4 KOH. A similar process uses NaCN to produce sodium gold cyanide (NaAu(CN 2)).
Statements which correspond to related hazards are grouped together by code number, so the numbering is not consecutive. The code is used for reference purposes, for example to help with translations, but it is the actual phrase which should appear on labels and safety data sheets. [4]
Potassium hypochlorite is produced by the disproportionation reaction of chlorine with a solution of potassium hydroxide: [2]. Cl 2 + 2 KOH → KCl + KOCl + H 2 O. This is the traditional method, first used by Claude Louis Berthollet in 1789.