Multiple Choice
Which of the following is a primary reason for using a solution in a chemical experiment?
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6. Chemical Quantities & Aqueous Reactions
Solutions
Multiple Choice
Which of the following representations correctly shows the species present when calcium chloride (CaCl_2) is dissolved in water?
A
Solid CaCl_2 particles floating in water
B
Only Ca^{2+} ions present, with no Cl^{-} ions
C
Ca^{2+} ions and Cl^{-} ions dispersed throughout the solution
D
CaCl_2 molecules remaining intact in solution
Verified step by step guidance1
Understand that calcium chloride (CaCl_2) is an ionic compound composed of Ca^{2+} cations and Cl^{-} anions.
Recall that when ionic compounds dissolve in water, they dissociate into their constituent ions due to the polar nature of water molecules.
Write the dissociation equation for CaCl_2 in water: \(\mathrm{CaCl_2 (s) \rightarrow Ca^{2+} (aq) + 2Cl^{-} (aq)}\).
Recognize that in solution, Ca^{2+} and Cl^{-} ions are dispersed and surrounded by water molecules, not existing as solid particles or intact molecules.
Conclude that the correct representation shows both Ca^{2+} and Cl^{-} ions dispersed throughout the solution, indicating complete dissociation.
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