Final answer:
Among the given pairs, B) Silver nitrate (AgNO3) and sodium sulfate (Na2SO4) will produce a precipitate when mixed because silver sulfate (Ag2SO4) is poorly soluble in water.
Step-by-step explanation:
The student is asking which pairs of aqueous solutions will produce a precipitate when mixed. To determine this, we must consider the solubility rules and the potential products of mixing ionic compounds. Here's the analysis of the provided pairs:
- A) Sodium chloride (NaCl) and potassium nitrate (KNO3): Both of these products would be soluble in water, and no precipitate would form.
- B) Silver nitrate (AgNO3) and sodium sulfate (Na2SO4): This combination would produce a precipitate. Silver sulfate (Ag2SO4) is poorly soluble, and would therefore form a precipitate.
- C) Hydrochloric acid (HCl) and sulfuric acid (H2SO4): Mixing these two acids does not result in a precipitation reaction; instead, it simply creates a more diluted acid solution.
- D) Calcium hydroxide (Ca(OH)2) and acetic acid (CH3COOH): This combination will undergo an acid-base reaction, but not a precipitation reaction. Calcium acetate is soluble in water, so no precipitate would form.
Therefore, the pair that will produce a precipitate is B) Silver nitrate (AgNO3) and sodium sulfate (Na2SO4).