Chemistry Electrochemistry BUMHS 2024
PMDC Verified Question 16 of 73
Water is ____ electrolyte.
A
Weak electrolyte
B
Strong electrolyte
C
Very strong electrolyte
D
Moderate electrolyte
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Weak electrolyte
Concept:

The strength of an electrolyte depends entirely on its ability to auto-ionize or dissociate into free charge carriers in solution.

Solution:

  • Pure water does undergo autoionization: \( H_2O \rightleftharpoons H^+ + OH^- \).


  • However, this equilibrium lies overwhelmingly to the left. At room temperature, the ion product constant of water (\( K_w \)) is tiny: \( 1.0 \times 10^{-14} \).


  • Because only about 1 in 10 million water molecules is ionized at any given moment, there are very few ions available to conduct electricity.


  • Thus, water is an extremely weak electrolyte.


Why other options are incorrect:

Strong electrolytes (like NaCl or HCl) dissociate nearly 100%. Water doesn't come close.

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