Ch.4 - Chemical Quantities & Aqueous ReactionsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: Calculate each of the following quantities:Number of Mg2+ ions in each milliliter of 0.184 M magnesium bromide

Solution: Calculate each of the following quantities:Number of Mg2+ ions in each milliliter of 0.184 M magnesium bromide

Problem

Calculate each of the following quantities:

Number of Mg2+ ions in each milliliter of 0.184 M magnesium bromide

Solution

The chemical formula for magnesium bromide is MgBr2. In water, it dissociates to form Mg2+ and Br ions.

MgBr2(aq) → Mg2+(aq) + 2 Br(aq)

From this, we can see that 1 mole of MgBr2 forms 1 mole of Mg2+. From Avogadro's number, there are 6.022 × 1023 ions in 1 mole. Recall that 1 M = 1 mol/L and 1 mL = 10–3 L.

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