Multiple Choice
What is the concentration (in M) of the chloride ion when 15.3 mL of a 0.629 M solution of barium chloride is combined with 18.9 mL of a 0.624 M solution of aluminum chloride? Assume the volumes are additive.
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6. Chemical Quantities & Aqueous Reactions
Molarity
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What is the concentration of K⁺ ions in a 0.15 M solution of K₂S?
A
0.075 M
B
0.30 M
C
0.45 M
D
0.15 M
Verified step by step guidance1
Identify the chemical formula of the compound: K₂S, which consists of 2 potassium ions (K⁺) and 1 sulfide ion (S²⁻).
Understand that the concentration given, 0.15 M, refers to the concentration of the entire K₂S compound in the solution.
Recognize that each formula unit of K₂S dissociates into 2 K⁺ ions and 1 S²⁻ ion in solution.
Calculate the concentration of K⁺ ions by multiplying the concentration of K₂S by the number of K⁺ ions produced per formula unit: \( [K^+] = 2 \times [K_2S] \).
Substitute the given concentration of K₂S (0.15 M) into the equation: \( [K^+] = 2 \times 0.15 \text{ M} \) to find the concentration of K⁺ ions.
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