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  2. Universal indicator - Wikipedia

    en.wikipedia.org/wiki/Universal_indicator

    A universal indicator is a pH indicator made of a solution of several compounds that exhibit various smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions. A universal indicator can be in paper form or present in a form of a solution. [1]

  3. pH - Wikipedia

    en.wikipedia.org/wiki/PH

    At 25 °C (77 °F), solutions with a pH less than 7 are acidic, and solutions with a pH greater than 7 are basic. Solutions with a pH of 7 at 25 °C are neutral (i.e. have the same concentration of H + ions as OH − ions, i.e. the same as pure water). The neutral value of the pH depends on the temperature and is lower than 7 if the temperature ...

  4. Calcium reactor - Wikipedia

    en.wikipedia.org/wiki/Calcium_reactor

    A pH controller is recommended to control the CO2. It works by connecting to the CO2 regulator on the CO2 tank and measuring the pH of the solution inside the reactor via a pH probe. The controller will turn on and off the flow of CO2 based on the pH inside the reactor. The pH range for the typical calcium reactor is 6.5–6.8.

  5. 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 .

  6. 32 types of saltwater fish for your aquarium - AOL

    www.aol.com/32-types-saltwater-fish-aquarium...

    Mesmerizing, kaleidoscopic, and fabulously exotic, the huge variety of types of saltwater fish to pick for your aquarium will give you a visual taste of the underwater ocean world. 32 types of ...

  7. Marine aquarium - Wikipedia

    en.wikipedia.org/wiki/Marine_aquarium

    Marine aquarists commonly test the water in the aquarium for a variety of chemical indicators of water quality. These include: Specific gravity, a relative measure of water density, is normally maintained between 1.020 and 1.024 in aquariums with fish only, and 1.023 and 1.026 for aquariums containing invertebrates. [21]

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