Conductivity κ of pure water is approximately:
A10⁻⁷ S/cm (very low)
B10⁻¹ S/cm
C10⁻⁵ S/cm
D1 S/cm
Answer & Solution
Correct answer: A. 10⁻⁷ S/cm (very low)
Pure water has very low conductivity (~5.5 × 10⁻⁸ S/cm) due to slight autoionization (2H2O → H3O+ + OH-, Kw = 10⁻¹⁴). Tap water (with dissolved salts) is much more conductive.
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