Multiple Choice
According to general solubility rules, what is the solubility of Mg(OH)2 in pure water?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Will precipitation occur when solutions of Na2SO4 and BaCl2 are mixed?
A
Yes, because NaCl is insoluble in water.
B
No, because BaSO4 is soluble in water.
C
No, because all products are soluble in water.
D
Yes, because BaSO4 is insoluble in water.
Verified step by step guidance1
Identify the ions present when solutions of Na2SO4 and BaCl2 are mixed. Na2SO4 dissociates into 2 Na\textsuperscript{+} and SO4\textsuperscript{2-} ions, and BaCl2 dissociates into Ba\textsuperscript{2+} and 2 Cl\textsuperscript{-} ions.
Determine the possible products formed by the combination of these ions. The cations and anions can recombine to form NaCl and BaSO4.
Use solubility rules to assess the solubility of the products. NaCl is generally soluble in water, while BaSO4 is known to be insoluble or sparingly soluble in water.
Since BaSO4 is insoluble, it will precipitate out of the solution when Ba\textsuperscript{2+} and SO4\textsuperscript{2-} ions meet, indicating that precipitation will occur.
Conclude that precipitation occurs due to the formation of insoluble BaSO4, not because of NaCl, which remains dissolved.
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