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Understanding Ionic Reaction Concentrations

Learn how to determine individual ion concentrations in ionic reactions based on initial compound concentrations. Explore examples with NaCl, MgCl2, and Al2(SO4)3. Understand the relationship between molar concentrations of compounds and resulting ion concentrations.

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Understanding Ionic Reaction Concentrations

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  1. Concentration of the ionic reactions:

  2. Ex: NaCl (aq) → Na+ (aq) + Cl- (aq) • If the concentration of NaCl is 4.0 molar then each of the ions have the same concentration. • NaCl (aq) → Na+ (aq) + Cl- (aq) • 4.0 M 4.0 M 4.0 M

  3. Ex: MgCl2 (aq) → Mg2+ (aq) + 2Cl- (aq) • If the concentration of MgCl2 is 2.3 molar then: • MgCl2 (aq) → Mg2+ (aq) + 2Cl- (aq) • 2.3 M 2.3 M 2(2.3 M) • 4.6 M • Chlorine has twice as many ions therefore the concentration of the ions is double.

  4. Al2(SO4)3 (aq) → 2Al3+ (aq) + 3 SO42-(aq) • 3.6 M 7.2 M 10.8 M

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