Answer to Question #114509 in General Chemistry for Timothy franklin

Question

why is the 0.1 m HCl(aq) is a worse conductor of electricity than the 6.0 m HCl?

Answer 1

Answer:

The conductance of the solution of a strong electrolyte increases with the concentration because the number of ions, formed by the dissociation of the electrolyte, increases. This is the reason why 0.1M HCl is a worse conductor of electricity than 6.0 M HCl. However, this effect doesn't extend to infinity: when there are too many ions in the solution, they start to feel friction with another ions, which decreases their mobility.

As you can see in the article[1], the maximum conductivity of HCl water solution is at around 5 M of HCl.

[1] : Artemov, Vasily & Volkov, A. & Sysoev, N.. (2015). Conductivity of aqueous HCl, NaOH and NaCl solutions: Is water just a substrate?. EPL (Europhysics Letters). 109. 10.1209/0295-5075/109/26002.