What makes electrolytes weak or strong?

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Homework question example:

Pure (deionized water)  - strong, weak, non?

Acetone - strong, weak, non?

Solid sugar - strong, weak, non?

I know water is neutral because I memorized that fact, but I have no idea about the concept.

Oct 3rd, 2015

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Pure (deionized water)  - , non

Acetone -  non

Solid sugar - , non

Electrolytes- A substance that when dissolved in water produces a solution that can conduct an electric current


Strong Electrolytes conduct current very efficiently

Completely ionized or dissociate when dissolved in water  (single arrow)

  a. Soluble Ionic compounds

  b. Strong acids (HNO3(aq), H2SO4(aq), HCl(aq))

  HNO3--> H+ + NO3-  (100% ionization)

  c. Strong bases (KOH and  NaOH)

  KOH -->K + +OH (100% dissociation)

***covalent substances ionize....ionic substances dissociate

Weak electrolytes conduct only a small current

Slightly ionized in solution  (double arrow)

  a. Weak acids (organic acids-->acetic, citric, butyric,malic, etc.)

  HC2H3O2<==> H+  + C2H3O2-

b. Weak bases (ammonia)

  NH3 + H2O<==> NH4+ OH-

Nonelectrolytes conduct no current

No ions present in solution

  a. alcohols, sugars

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Oct 3rd, 2015

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