Chemistry Practice Problems Electrolytes Practice Problems Solution: Assuming the concentrations of all of the aqueous ...

Solution: Assuming the concentrations of all of the aqueous solutions are 1.0 M, which of following is expected to be the strongest electrolyte?A. NaClB. K2SO3C. C6H6D. HFE. NH4Cl

Problem

Assuming the concentrations of all of the aqueous solutions are 1.0 M, which of following is expected to be the strongest electrolyte?

A. NaCl
B. K2SO3
C. C6H6
D. HF
E. NH4Cl

Solution

We’re being asked to determine the strongest electrolyte among the choices. 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 and hydrocarbons: for example C6H12O6 (glucose) and C12H22O11 (sucrose)

c. Water (H2O)


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