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  2. Bromothymol blue - Wikipedia

    en.wikipedia.org/wiki/Bromothymol_blue

    The protonated form of bromothymol blue has its peak absorption at 427 nm thus transmitting yellow light in acidic solutions, while the deprotonated form has its peak absorption at 602 nm thus transmitting blue light in more basic solutions. [3] In contrast, highly acidic bromothymol blue is magenta in color.

  3. 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 ...

  4. pH indicator - Wikipedia

    en.wikipedia.org/wiki/PH_indicator

    The observed spectrum (green) is the sum of the spectra of HA (gold) and of A − (blue), weighted for the concentration of the two species. When a single indicator is used, this method is limited to measurements in the pH range p K a ± 1, but this range can be extended by using mixtures of two or more indicators.

  5. Color of chemicals - Wikipedia

    en.wikipedia.org/wiki/Color_of_chemicals

    where E is the energy of the quantum , f is the frequency of the light wave, h is the Planck constant, λ is the wavelength and c is the speed of light. The relationships between the energies of the various quantum states are treated by atomic orbital , molecular orbital , Ligand Field Theory and Crystal Field Theory .

  6. Photofermentation - Wikipedia

    en.wikipedia.org/wiki/Photofermentation

    Photofermentation differs from dark fermentation because it only proceeds in the presence of light. For example, photo-fermentation with Rhodobacter sphaeroides SH2C (or many other purple non-sulfur bacteria [1]) can be employed to convert small molecular fatty acids into hydrogen [2] and other products. [3] Depicts general process of ...

  7. File:Bromothymol blue colors at different pH.png - Wikipedia

    en.wikipedia.org/wiki/File:Bromothymol_blue...

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  8. Hydrogen production - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_production

    As of 2020, estimated costs of production are $1–1.80/kg for grey hydrogen and blue hydrogen, [177] and $2.50–6.80 for green hydrogen. [177] 94 million tonnes of grey hydrogen are produced globally using fossil fuels as of 2022, primarily natural gas, and are therefore a significant source of greenhouse gas emissions. [178] [179] [180] [181]

  9. File:Bromothymol blue protolysis.svg - Wikipedia

    en.wikipedia.org/wiki/File:Bromothymol_blue...

    The following other wikis use this file: Usage on de.wikipedia.org Benutzer:Steffen 962/Archiv Formeln; Usage on eo.wikipedia.org Bromotimolbluo

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