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Many fruits and liquids can be used for the acidic electrolyte. Fruit is convenient, because it provides both the electrolyte and a simple way to support the electrodes. The acid involved in citrus fruits (lemons, oranges, grapefruits, etc.) is citric acid. The acidity, which is indicated by the measured pH, varies substantially.
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battery, Zinc–Bromine flow (ZnBr) [30] 0.27: battery, Nickel–metal hydride (NiMH), High-Power design as used in cars [31] 0.250: 0.493: battery, Nickel–Cadmium (NiCd) [23] 0.14: 1.08: 80% [26] battery, Zinc–Carbon [23] 0.13: 0.331: battery, Lead–acid [23] 0.14: 0.36: battery, Vanadium redox: 0.09 [citation needed] 0.1188: 70-75% ...
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Paper form: It is a strip of coloured paper which changes colour to red if the solution is acidic and to blue, if the solution is basic. The strip can be placed directly onto a surface of a wet substance or a few drops of the solution can be dropped onto the universal indicator using dropping equipment.
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In older literature, it was also called: Salt of sorrel, [1] sorrel salt, sel d'oseille, [2] [3] sal acetosella; or, inaccurately, salt of lemon (due to the similar acidic “lemony” taste of the edible common sorrel or garden sorrel) [4] Potassium hydrogenoxalate occurs in some plants, notably sorrel. It is a commercial product used in ...