Multiple Choice
Which graph best represents the change in solubility of BaCO3 as HNO3 is gradually added to an aqueous solution?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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According to solubility rules, which statement best describes the solubility of Na3PO4 in 200 g of water at 40 °C?
A
Na3PO4 is highly soluble in water, and almost all of it will dissolve at 40 °C.
B
Na3PO4 is soluble only in hot water above 100 °C.
C
Na3PO4 is generally insoluble in water, so only a very small amount will dissolve at 40 °C.
D
Na3PO4 is moderately soluble in water, and a significant amount can dissolve at 40 °C.
Verified step by step guidance1
Recall the general solubility rules for ionic compounds in water, which state that most sodium (Na⁺) salts are soluble in water regardless of the anion.
Identify that Na₃PO₄ (sodium phosphate) contains sodium ions (Na⁺) and phosphate ions (PO₄³⁻). According to solubility rules, all sodium salts are typically soluble in water.
Understand that solubility depends on temperature, but since sodium salts are generally highly soluble, Na₃PO₄ will dissolve well in water even at moderate temperatures like 40 °C.
Compare the given statements with the solubility rules: since Na₃PO₄ is a sodium salt, it is expected to be highly soluble, so the statement claiming it is generally insoluble is incorrect.
Conclude that the best description is that Na₃PO₄ is highly soluble in water, and almost all of it will dissolve at 40 °C.
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