Multiple Choice
What is the concentration (M) of KCl in a solution made by mixing 30.0 mL of 0.100 M KCl with 50.0 mL of 0.100 M KCl?
6. Chemical Quantities & Aqueous Reactions
Molarity
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What is the concentration of K⁺ ions in a 0.025 M K₂CO₃ solution assuming complete dissociation?
A
0.075 M
B
0.050 M
C
0.100 M
D
0.025 M
Verified step by step guidance1
Identify the chemical formula of the compound: K₂CO₃, which is potassium carbonate.
Understand that K₂CO₃ dissociates completely in water into 2 K⁺ ions and 1 CO₃²⁻ ion.
Write the dissociation equation: K₂CO₃ → 2 K⁺ + CO₃²⁻.
Recognize that the stoichiometry of the dissociation shows that for every 1 mole of K₂CO₃, 2 moles of K⁺ ions are produced.
Calculate the concentration of K⁺ ions by multiplying the initial concentration of K₂CO₃ (0.025 M) by the stoichiometric coefficient of K⁺ ions (2), resulting in 0.050 M K⁺.
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