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The method can be used for titrating coloured solutions or homogeneous suspension (e.g.: wood pulp suspension [5]), which cannot be used with normal indicators. Acid-base titrations and redox titrations are often performed in which common indicators are used to locate the end point e.g., methyl orange, phenolphthalein for acid base titrations ...
Quinaldine red is an indicator that turns from colorless to red between a pH of 1.0–2.2. [5] The image below shows what color quinaldine red would appear as in a given pH. Color change of Quinaldine red in pH change
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 ...
where A and B are reactants C is a product a, b, and c are stoichiometric coefficients,. the reaction rate is often found to have the form: = [] [] Here is the reaction rate constant that depends on temperature, and [A] and [B] are the molar concentrations of substances A and B in moles per unit volume of solution, assuming the reaction is taking place throughout the volume of the ...
The constant with a value of 2.69×10 5 has units of C mol −1 V −1/2; For novices in electrochemistry, the predictions of this equation appear counter-intuitive, i.e. that i p increases at faster voltage scan rates. It is important to remember that current, i, is charge (or electrons passed) per unit time.
It changes the parameters of the Deal-Grove model to better model the initial oxide growth with the addition of rate-enhancement terms. The Deal-Grove model also fails for polycrystalline silicon ("poly-silicon"). First, the random orientation of the crystal grains makes it difficult to choose a value for the linear rate constant.
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Phenolphthalein's common use is as an indicator in acid-base titrations. It also serves as a component of universal indicator, together with methyl red, bromothymol blue, and thymol blue. [3] Phenolphthalein adopts different forms in aqueous solution depending on the pH of the solution.