Question

Answer All Blanks (Analytical Chemistry):

(a) In electrochemistry, SHE stands for Standard hydrogen electrode with a half-cell reaction of Ox + ne = Red. The electrode potential has assigned to be 0.000 V at any temperature. This electrode is known as the____________ [(i) the primary or (ii) secondary] reference electrode.

(b)A pH glass electrode can be defined as______________________________________, and it must be immersed in water before and after use because __________________

Answer 1

(a) In electrochemistry, SHE stands for Standard hydrogen electrode with a half-cell reaction of Ox + ne = Red. The electrode potential has assigned to be 0.000 V at any temperature. This electrode is known as the Primary[(i) the primary or (ii) secondary] reference electrode.

** For information: SCE (Saturated calomel electrode) is the Secodary reference electrode.

(b)A pH glass electrode can be defined as ion-selective electrode which is made of doped glass membrane and is sensitive to a specific ion and it must be immersed in water before and after use because impurities before the measuremet or remains after the measurement might influence the performance (measurement) of the glass electrode as it is very sensitive to the ions.