Fill in the blanks (a) A pH glass electrode can be defined as __________________

Question

Fill in the blanks

(a) A pH glass electrode can be defined as ___________________________, and it must be immersed in water before and after use because ________________________.

(b) In potentiometry, the electrochemical cell's _______ [(i) Potential/voltage (ii) Current (III) resistance] between the indicator (or working) and the refrence electrode is measured. The analyte concentration/activity is calculate on the basis of ________________ equation. A calibration using a series of standard solutions is often used. To minimize system error, __________ and ___________ [(i) temperature (ii) Volume (iii) moisture (iv) room light intensity, and/or (v) electrochemical concentration] of the standard and unknown sample should be kept constant if possible

(c) 25.00 mL of 0.01000 M oxalic acid is titrated with 1.000 mM potassium permanganate. At the equivalent point _______ mL of the titrant will be used. In this titration ____________ can be used as an indicator and the solution color is changed from _________ to ________ at the end point with a ______________ [(i) positive or (ii) negative] titration error because _________________.

Explanation / Answer

(a) reference electrode , to minimise clogging of salt and quick response

(b) potential/voltage , Nernst equation. temperature and electrochemical concentration

(c) 100 mL, KMnO4 , colourless to pink

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