1. All of the following are true for the measurement of standard reduction poten
ID: 555807 • Letter: 1
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1. All of the following are true for the measurement of standard reduction potentials, except: I standard conditions for reduction potentials is 25 °C and A = 1 for all aqueous and gaseous species. Il reduction potentials are measured relative to the standard hydrogen electrode (S.H.E.). Ili standard reduction potentials are measured while connected to the negative electrode of the potentiometer. IV the E' for the S.H.E. is defined as 0 volts. A) I and IV B) land || C) I only Dyul only E) II and IV cell potential. 2. A galvanic cell with a large equilibrium constant has a A) negative B) constant C) zero voltage (Dpositive E) variable 3. Which is true when electrochemical cells are used as chemical probes? 1. All concentrations in the half-cells must be known except for the analyte of interest. || The analyte concentration is calculated from the equilibrium cell potential. III Equilibrium between the half-cells is established. IV Equilibrium within each half-cell is established and is assumed to remain at equilibrium. V Half-cells other than the S.H.E. can be used to determine pH. A) II, 111, and IV B) I, IV, and v C1 and il D) III, IV, and VE) 1, 11, and v 4. Eº" is defined as: A) the formal half-cell potential for compounds that are neither acids nor bases. B) the formal half-cell potential at 20 °C. (C) he formal half-cell potential at pH 7. D) the inverse of E°. E) None of these answers is the definition of E°". 5. For the cell diagram below write out and balance the reaction that occurs in the cell. Pt|HOCl (aq, 1 M), HClO2 (aq, 1 M), H* (aq, 1 M)|| Mno, (aq, 1 M), H* (aq, 1 M) | MnO2 (s)|PtExplanation / Answer
Ans 1 : III only
SHE refers to the standard hydrogen electrode , whose electrode potential is estimated around 4.44 V at 25oC.
The half cell reaction is given as :
2H+(aq) + 2e- = H2(g)
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