7 + 1 (bonus) questions for an overall of 100 + 10 points. 1. (35 pts) Fill in t

Question

7 + 1 (bonus) questions for an overall of 100 + 10 points. 1. (35 pts) Fill in the blanks (a) (4 pts) In electrochemistry, SHE stands for with a half-cell reaction of be secondary] reference electrode. The electrode potential has assigned to the primary or (ii) V at any temperature. This electrode is known as the (b). (2 pts) A pH glass electrode can be defined as and it must be immersed in water before and after use because (c) (2 pts) A rechargeable battery can be considered as a galvanic cell or an electrolytic cell. This is because main function of a salt bridge in an electrochemical cell is

Explanation / Answer

1)

a) SHE stand for Standard Hydrogen electrode with a Half sell reaction 2 H+ + 2e- ----> H2 (g) . The electrode potential has assiged to be Zero V at any temperature. It is known as Primary reference electrode.

b) pH glass electrode can defined as a type of ion selective electrode made of doped glass membrane that is sensitive to a specific ion. It has to be immersed in water before and after the usage beacuse it has to be cleaned so that no traced of any other impurities will be attched to it which will impact the reading.

c)A rechargeable battery is considered as galvanic call beacuse during charging the active metal gets oxidized , producing the electron and negative material is reducing which is the same mechanism happens in the galvanic cell - oxidation and reduction resulting in the electron flow

d) Main function of the salt-bridge in the electrochecmical cell is not to move the electrons from electrolytemaintain the charge balance as electrons are moving from anode to cathode.

**Note: Answering the first four sub parts as per the policy.

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