In potentiometry we need a reference electrode in order to ensure the system is

Question

In potentiometry we need a reference electrode in order to ensure the system is at equilibrium. allow more current to circulate through the system. set a stable point from which to measure a potential difference Provide a salt bridge that allows ions to counterbalance the charge. In order to characterize cytochrome c, it is immobilized onto an electrode to measure the electrochemistry. To determine how much of the cytochrome c has been deposited on the surface of the electrode, the charge is measured. How many picomoles of cytochrome c per square centimeter are deposited and reacting on the surface if 350.1 nC are measured in a one electron redox reaction at a 0.32 cm^2 electrode? 22 pmol cm^-2 11 pmol cm^-2 9.5 pmol cm^2 3.6 pmol cm^-2 A cell was prepared by dipping a Zn wire and a saturated calomel electrode (E^degree = 0.241 V) into 0.101 M ZnsO_4 solution. The Zn wire was attached to the positive terminal of a potentiometer and the calomel electrode was attached to the negative terminal. Calculate the cell potential given the information. Zn^2+ 2e Zn(s) E^degree = -0.762 V -1.032 V -0.974 V -0.821 V -0.791 V Given the standard reduction potential (E^degree) values below, calculate the equilibrium constant (K_eq) for the reaction: 2Mn^2+ + 5pbO_2(s) + 4H^+ 5pb^^2+ + 2MnO^- _4 + 2H_2O 3.5 times 10^9 5.9 times 10^-5 4.9 times 10^1 2.8 times 10^8

Explanation / Answer

Q39

a) false, no need for equilibrium measure

b) false, no need to flow current

c) true, we need a reference point, i.e. a stable point for potential difference

d) false, slat bridge is not replaced by a electrode reference

choose C

Consider posting multiple questions in multiple set of Q&A. We are not allowed to answer to multiple questions in a single set of Q&A

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---