Multiple Choice
Ca3(PO4)2 is being dissolved in water. If only 0.46 g of Ca3(PO4)2 will dissolve in 100 mL of water at 25 °C, what is the solubility product, Ksp, of this salt at this temperature?
6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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In which of the following solutions is sodium acetate (NaCH3COO) most soluble?
A
Aqueous NH3
B
Aqueous CH3COOH
C
Aqueous HF
D
Aqueous NaCl
Verified step by step guidance1
Understand the concept of solubility and how it can be affected by the nature of the solvent. Solubility is the ability of a solute to dissolve in a solvent, forming a homogeneous solution.
Consider the chemical nature of sodium acetate (NaCH3COO). It is a salt derived from a weak acid (acetic acid, CH3COOH) and a strong base (sodium hydroxide, NaOH).
Apply the concept of 'like dissolves like,' which suggests that polar solutes are more soluble in polar solvents, and nonpolar solutes are more soluble in nonpolar solvents.
Evaluate the acidity or basicity of the solvents provided: Aqueous NH3 is basic, Aqueous CH3COOH is acidic, Aqueous HF is weakly acidic, and Aqueous NaCl is neutral.
Recognize that sodium acetate will be most soluble in an acidic solution due to the common ion effect and the ability of the acid to suppress the ionization of acetate ions, thus favoring the dissolution of sodium acetate. Therefore, aqueous CH3COOH is the most suitable solvent for dissolving sodium acetate.
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