INDICATOR PAPERS: Variety

INDICATOR PAPERS: Variety

• Various indicator paper strips for laboratory use includes:
  Bromocresol green / Bromocresol purple / Bromothymol blue / Cobalt chloride / Lead acetate / Methyl orange / Nitrate-nitrite / Peroxide / Phenolphthalein / Thymol blue

(Wikipedia excerpt: ..."...A pH indicator [I] is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually or spectroscopically by changes in absorption and/or emission properties.[1] Hence, a pH [I] is a chemical detector for hydronium ions (H3O+) or hydrogen ions (H+) in the Arrhenius model.

Normally, the [I] causes the color of the solution to change depending on the pH. [I] can also show change in other physical properties; for example, olfactory [I] show change in their odor. The pH value of a neutral solution is 7.0 at 25°C (standard laboratory conditions). Solutions with a pH value below 7.0 are considered acidic and solutions with pH value above 7.0 are basic. Since most naturally occurring organic compounds are weak electrolytes, such as carboxylic acids and amines, pH [I] find many applications in biology and analytical chemistry....")

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