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2. Electroanalytical methods - Wikipedia

   en.wikipedia.org/wiki/Electroanalytical_methods

   Potentiometry usually uses indicator electrodes made selectively sensitive to the ion of interest, such as fluoride in fluoride selective electrodes, so that the potential solely depends on the activity of this ion of interest. The time that takes the electrode to establish equilibrium with the solution will affect the sensitivity or accuracy ...

3. Ion transport number - Wikipedia

   en.wikipedia.org/wiki/Ion_transport_number

   An acid-base indicator such as bromophenol blue is added to make visible the boundary between the acidic HCl solution and the near-neutral CdCl 2 solution. [8] The boundary tends to remain sharp since the leading solution HCl has a higher conductivity that the indicator solution CdCl 2 , and therefore a lower electric field to carry the same ...

4. Redox indicator - Wikipedia

   en.wikipedia.org/wiki/Redox_indicator

   A redox indicator (also called an oxidation-reduction indicator) is an indicator which undergoes a definite color change at a specific electrode potential. The requirement for fast and reversible color change means that the oxidation-reduction equilibrium for an indicator redox system needs to be established very quickly. Therefore, only a few ...

5. Ferroxyl indicator solution - Wikipedia

   en.wikipedia.org/wiki/Ferroxyl_indicator_solution

   Corrosion of iron nail with coiled copper in medium with ferroxyl indicator. 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.

6. Titration - Wikipedia

   en.wikipedia.org/wiki/Titration

   Indicator: A substance that changes color in response to a chemical change. An acid–base indicator (e.g., phenolphthalein) changes color depending on the pH. Redox indicators are also used. A drop of indicator solution is added to the titration at the beginning; the endpoint has been reached when the color changes.

7. Complexometric indicator - Wikipedia

   en.wikipedia.org/wiki/Complexometric_indicator

   A complexometric indicator is an ionochromic dye that undergoes a definite color change in presence of specific metal ions. [1] It forms a weak complex with the ions present in the solution, which has a significantly different color from the form existing outside the complex. Complexometric indicators are also known as pM indicators. [2]

8. The Secret Bedtime Hack I Followed to Fall Asleep an Hour Earlier

   www.aol.com/secret-bedtime-hack-followed-fall...

   Turn off the TV and phone. “All screens should be turned off at least one hour before bedtime,” says Dasgupta. “The blue light emitted by screens can interfere with melatonin production ...

9. Universal indicator - Wikipedia

   en.wikipedia.org/wiki/Universal_indicator

   A roll of universal indicator pape Colors of 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 ...