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A reversible hydrogen electrode ( RHE) is a reference electrode, more specifically a subtype of the standard hydrogen electrodes, for electrochemical processes. Unlike the standard hydrogen electrode, its measured potential does change with the pH, so it can be directly used in the electrolyte. [1] [2] [3]
In electrochemistry, the standard hydrogen electrode (abbreviated SHE ), is a redox electrode which forms the basis of the thermodynamic scale of oxidation-reduction potentials.
Reversible hydrogen electrode (RHE) (E = 0.000 V - 0.0591 × pH) at 25 C Saturated calomel electrode (SCE) (E = +0.241 V saturated) Copper-copper(II) sulfate electrode (CSE) (E = +0.314 V) Silver chloride electrode (E = +0.197 V in saturated KCl) (E = +0.
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What does pH mean in chemistry?
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Main article: Standard electrode potential. The data below tabulates standard electrode potentials ( E °), in volts relative to the standard hydrogen electrode, at: Temperature 298.15 K (25.00 °C; 77.00 °F); Effective concentration 1 mol/L for each aqueous or amalgamated (mercury-alloyed) species;
External links. pH. Test tubes containing solutions of pH 1–10 colored with an indicator. In chemistry, pH ( / piːˈeɪtʃ / pee-AYCH ), also referred to as acidity or basicity, historically denotes " potential of hydrogen " (or "power of hydrogen"). [1] . It is a logarithmic scale used to specify the acidity or basicity of aqueous solutions.
A pH meter is a scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as pH. [2] .
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 ).
