O Levels Chemistry (5070)•5070/12/O/N/23
Explanation
Soluble salts from acid-carbonate neutralization reactions Steps:
- Identify reactions: three acids (HCl, H2SO4, HNO3) react with CaCO3 and the fifth reagent (likely a soluble base like Na2CO3 or NaOH, omitted in listing).
- Form salts: NaCl and CaCl2 from HCl; Na2SO4 from H2SO4 with Na+ source (CaSO4 insoluble); NaNO3 and Ca(NO3)2 from HNO3.
- Assess solubility: NaCl, Na2SO4, NaNO3, CaCl2, Ca(NO3)2 are soluble; CaSO4 is not.
- Count: five soluble salts result.
Why C is correct:
- Five soluble salts (NaCl, Na2SO4, NaNO3, CaCl2, Ca(NO3)2) form via acid-base reactions, per solubility rules excluding insoluble CaSO4.
Why the others are wrong:
- A: Misses two Na+ salts from the soluble base.
- B: Misses one Na+ salt from the soluble base.
- D: Overcounts by including insoluble CaSO4.
Final answer: C
Topic: Preparation of salts
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