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The galvanic cells in which electrodes are made of same metal but they are immersed in the electrolytes of different concentrations in two half cells are called concentration cells. The difference in the concentrations of electrolytes in the two half cells, creates potential difference across the two electrodes. The electrode which is placed in electrolyte of larger concentration acts as cathode or + terminal. Whereas electrode which is placed in electrolyte of lower concentration acts as anode or -ve terminal.The cell can be represented as Cu/CuSO4 (0.01 M) ? CuSO4 (1 M)/Cu or simply as Cu/Cu2+ (0.01 M) ? Cu2+ (1 M)/Cu.Similarly, hydrogen ion concentration cell can be constituted by connecting hydrogen electrodes placed in hydrochloric acid solutions of different concentration. It can be represented as Pt, H2 (1 bar)/H+ (0.01 M) ? H+ (1 M)/H2 (1 bar), Pt.Ecell of concentration cellConsider the consideration cell of the type M/Mn+ (C1) ? Mn+(C2)/M. since standard electrode potentials of the two electrodes cancel each other, the emf of the cell can be written on the basis of Nerst equation as Ecell = (0.059/n) log C2/C1Evidently, for Ecell to be positive C2 > C1.
which element has the highest oxidation state and why?
The atomic number of an element is 35 and mass number is 81. The number of electrons in the outer most shell is: (1) 7 (2) 6 (3) 5 (4) 3 Ans: 7
How do you explain in the absence of aldehyde group in the pentaacetate of d- glucose Solution) If we add fehling''s solution to D glucose pentaacetate ,no reaction takes place w
Nitrogen Containing Compounds The important nitrogen consisting of organic compounds that are alkyl nitrites (RONO), nitro-alkanes (RNO 2 ), amines (- NH 2 ), aromatic nitro co
Q. Determine the impurities in the sample of oil? After conducting this activity, you will be able to: • determine impurities such as total dirt and organic dirt in the giv
The effects that temperature has on the equilibrium position of a reaction can also be explained by using Le Chtelier's Principle. Recall that in an exothermic reaction, heat i
Q. Describe the ion exchange process of softening hard water. What are its advantages? Ans. Determination of ion exchange or Deionization process: In this pro
Q. Define standard reduction potential ? Ans. The standard reduction potential, E o As we have seen in the example of a chemical cell in the previous section, the redox rea
hardness of borewell water is less than that of seawater
titration curve or eak acid and eak base
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