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2. pH meter - Wikipedia

   en.wikipedia.org/wiki/PH_meter

   The pH meter is calibrated with solutions of known pH, typically before each use, to ensure accuracy of measurement. [11] To measure the pH of a solution, the electrodes are used as probes, which are dipped into the test solutions and held there sufficiently long for the hydrogen ions in the test solution to equilibrate with the ions on the ...

3. pH indicator - Wikipedia

   en.wikipedia.org/wiki/PH_indicator

   A pH indicator 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 indicator is a chemical detector for hydronium ions (H 3 O +) or hydrogen ions (H +) in the ...

4. RightspotpH Indicator - Wikipedia

   en.wikipedia.org/wiki/RightspotpH_Indicator

   The effectiveness of the RightSpotpH® Indicator has been validated through clinical studies. A significant study published in the International Journal of Emergency Medicine demonstrated that the device is sensitive and specific for determining intragastric pH levels below or above 5.5, a common threshold used for confirming nasogastric tube placement.

5. pH - Wikipedia

   en.wikipedia.org/wiki/PH

   Primary pH standard values are determined using a concentration cell with transference by measuring the potential difference between a hydrogen electrode and a standard electrode such as the silver chloride electrode. The pH of aqueous solutions can be measured with a glass electrode and a pH meter or a color-changing indicator.

6. 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]

7. 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 .