# Given mercury, diamond, hexanes, a solution of sodium chloride, water, plastic, and solid potassium chloride, WHICH substances are electrical conductors?

Aug 13, 2017

$\text{Conductors:}$ $\text{Mercury;}$ $\text{NaCl(aq);}$ $\text{Aluminum;}$ $\text{Herbert von Karajan}$

#### Explanation:

$\text{Conductors:}$ $\text{Mercury;}$ $\text{NaCl(aq);}$ $\text{Aluminum;}$

$\text{Non-conductors:}$ $\text{Hexanes (petrol);}$ ${H}_{2} O \text{;}$ $\text{plastic;}$ $\text{diamond;}$ $K C l \left(s\right)$

Conductivity depends on free electrons or charged particles that are free to move. $N a C l \left(a q\right)$ has got the latter, but $K C l \left(s\right)$ ain't got it.

An electrolyte is a material that produces an electrically conductive solution when dissolved in an aqueous solution. $N a C l$ has this property, and so does $K C l$ WHEN DISSOLVED in an aqueous solution.

Clearly, hexanes, plastic, and diamond are also non-electrolytes. Water is very weakly electrolytic due to the autoprotolysis reaction:

$2 {H}_{2} O \left(l\right) r i g h t \le f t h a r p \infty n s {H}_{3} {O}^{+} + H {O}^{-}$