Multiple Choice
Which of the following is the correct solubility product (K_sp) expression for Mg3(PO4)2(s) dissolving in water?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which of the following lists the major species present when Na2SO4 is dissolved in water?
A
Na+, SO4^{2-}, and H2O
B
Na2SO4 and SO4^{2-}
C
Na+, SO4^{2-}, and Na2SO4
D
Na2SO4, Na+, and H2O
Verified step by step guidance1
Recognize that Na2SO4 is an ionic compound composed of sodium ions (Na+) and sulfate ions (SO4^{2-}).
Understand that when Na2SO4 dissolves in water, it dissociates completely into its constituent ions because it is a strong electrolyte.
Write the dissociation equation: $\mathrm{Na_2SO_4 (s) \rightarrow 2\ Na^+ (aq) + SO_4^{2-} (aq)}$.
Identify the major species present in the solution after dissolution: the sodium ions ($Na^+$), sulfate ions ($SO_4^{2-}$), and water ($H_2O$) as the solvent.
Conclude that the solid Na2SO4 does not remain in solution as a major species, so the correct list includes $Na^+$, $SO_4^{2-}$, and $H_2O$.
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