Chemistry Practice Problems Electrolytes Practice Problems Solution: Aqueous solutions of three different substances, A...

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Solution: Aqueous solutions of three different substances, AX, AY, and AZ, are represented by the three diagrams below.Identify each substance as a strong electrolyte, weak electrolyte, or nonelectrolyte.

Problem

Aqueous solutions of three different substances, AX, AY, and AZ, are represented by the three diagrams below.Diagrams show (a) AX, with molecules made of two different atoms; (b) AY, with molecules made of two different atoms plus ions in solution; or (c) AZ, with two different ions in solution.

Identify each substance as a strong electrolyte, weak electrolyte, or nonelectrolyte.

Solution

We’re being asked to classify each given compound as a strong electrolyte, weak electrolyte, or nonelectrolytes


Recall that:


• Strong electrolytes: dissociate completely in water; include soluble ionic salts, strong acids, and bases

a. Ionic salts: those that follow the rules of being soluble in solubility rules

b. Strong acids: HCl, HBr, HI, HNO3, H2SO4, HClO4, HClO3

c. Strong bases: Group 1A and 2A (Ca and lower) metals paired with OH, H, O2–, or NH2


• Weak electrolytes: doesn’t dissociate completely in water; include weak acids and bases

a. Weak acids: include HF, HC2H3O2, HNO2, H2CO3, H3PO4

b. Weak bases: Be(OH)2, Mg(OH)2, NH3, NH4OH


• Nonelectrolytes: doesn’t dissociate at all; include molecular compounds

a. Alcohols: composed of carbon and hydrogen with a –OH group

b. Sugars: for example C6H12O6 (glucose) and C12H22O11 (sucrose)

c. Water (H2O)


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