Multiple Choice
When MgBr_2 is dissolved in water, how many ions are produced from one formula unit?
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2. Atoms & Elements
Ions
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Which of the following lists all the ions present in the reactants when calcium chloride and sodium phosphate are dissolved in water?
A
Ca^{2+}, Na^+, Cl^-, SO_4^{2-}
B
Ca^{2+}, Cl^-, Na^+, PO_4^{3-}
C
Ca^{2+}, Cl^-, Na^+, NO_3^-
D
Ca^{2+}, Cl^-, Na^+, CO_3^{2-}
Verified step by step guidance1
Identify the compounds given: calcium chloride (CaCl_2) and sodium phosphate (Na_3PO_4).
Recall that when ionic compounds dissolve in water, they dissociate into their constituent ions.
Write the dissociation equations for each compound: \\ $CaCl_2 \rightarrow Ca^{2+} + 2Cl^-$ and $Na_3PO_4 \rightarrow 3Na^+ + PO_4^{3-}$.
List all ions present in the solution by combining the ions from both dissociations: $Ca^{2+}$, $Cl^-$, $Na^+$, and $PO_4^{3-}$.
Compare this list to the options given to identify the correct set of ions present in the reactants.
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