Multiple Choice
When a solid is dissolved into a liquid, which of the following best describes the process?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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According to general solubility rules, which statement best describes the solubility of Na2HAsO4 (sodium hydrogen arsenate) in water at 60 °C?
A
Na2HAsO4 is only slightly soluble in water at 60 °C.
B
Na2HAsO4 is insoluble in water at 60 °C.
C
Na2HAsO4 is soluble in water at 60 °C.
D
Na2HAsO4 decomposes in water at 60 °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 regardless of the anion they are paired with.
Identify the cation and anion in Na₂HAsO₄: the cation is sodium (Na⁺), and the anion is hydrogen arsenate (HAsO₄²⁻).
Apply the solubility rule that all sodium salts are soluble in water, meaning Na₂HAsO₄ should dissolve readily in water.
Consider the temperature effect: increasing temperature generally increases solubility for most solids, so at 60 °C, Na₂HAsO₄ is expected to be soluble or even more soluble than at room temperature.
Conclude that based on these rules and temperature considerations, Na₂HAsO₄ is soluble in water at 60 °C.
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