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  2. Phenolphthalein - Wikipedia

    en.wikipedia.org/wiki/Phenolphthalein

    Phenolphthalein's pH sensitivity is exploited in other applications: concrete has naturally high pH due to the calcium hydroxide formed when Portland cement reacts with water. As the concrete reacts with carbon dioxide in the atmosphere, pH decreases to 8.5–9. When a 1% phenolphthalein solution is applied to normal concrete, it turns bright pink.

  3. Ferroxyl indicator solution - Wikipedia

    en.wikipedia.org/wiki/Ferroxyl_indicator_solution

    Ferroxyl indicator, or rust indicator, is a solution containing potassium hexacyanoferrate(III), phenolphthalein and sodium chloride. It turns blue in the presence of Fe 2+ ions, and pink in the presence of hydroxide (OH-) ions. It can be used to detect metal oxidation, and is often used to detect rusting in various situations.

  4. Universal indicator - Wikipedia

    en.wikipedia.org/wiki/Universal_indicator

    Solution: The main components of a universal indicator, in the form of a solution, are thymol blue, methyl red, bromothymol blue, and phenolphthalein. This mixture is important because each component loses or gains protons depending upon the acidity or alkalinity of the solution being tested. It is beneficial to use this type of universal ...

  5. Base (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Base_(chemistry)

    Aqueous solutions or molten bases dissociate in ions and conduct electricity. Reactions with indicators: bases turn red litmus paper blue, phenolphthalein pink, keep bromothymol blue in its natural colour of blue, and turn methyl orange-yellow. The pH of a basic solution at standard conditions is greater than seven. Bases are bitter. [5]

  6. Bromothymol blue - Wikipedia

    en.wikipedia.org/wiki/Bromothymol_blue

    To prepare a solution for use as pH indicator, dissolve 0.10 g in 8.0 cm 3 N/50 (a.k.a. 0.02 Normal) NaOH and dilute with water to 250 cm 3. To prepare a solution for use as indicator in volumetric work, dissolve 0.1 g in 100 cm 3 of 50% (v/v) ethanol .

  7. Phthalic anhydride - Wikipedia

    en.wikipedia.org/wiki/Phthalic_anhydride

    Phenolphthalein can be synthesized by the condensation of phthalic anhydride with two equivalents of phenol under acidic conditions (hence the name). It was discovered in 1871 by Adolf von Baeyer. [8] [9] [10] Synthesis of phenolphthalein [11]

  8. Easy & Adorable Mashed Potato Snowmen Almost Too Cute to Eat

    www.aol.com/easy-adorable-mashed-potato-snowmen...

    Boil if you’re using a stovetop method. Once it’s boiling, reduce the heat to a smaller boil so it doesn’t overflow. Cook until you can pierce the potatoes with a fork and it easily slides ...

  9. pH indicator - Wikipedia

    en.wikipedia.org/wiki/PH_indicator

    Normally, the indicator causes the color of the solution to change depending on the pH. Indicators can also show change in other physical properties; for example, olfactory indicators 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 ...