Question

Which 2 combinations produced a precipitate 1. Ca(NO3)2 (aq) and H2SI4 (aq) 2. Ca(NO3)2 (aq) and...

Which 2 combinations produced a precipitate
1. Ca(NO3)2 (aq) and H2SI4 (aq)
2. Ca(NO3)2 (aq) and Na2CO3 (aq)
3. Ca(NO3)2 (aq) and (NH4)2C2O4 (aq)
4. Ca(NO3)2 (aq) and KIO3 (aq)
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Answer #1

Precipitation reactions are examples of double‑displacement reactions. Precipitation reactions have one product that is insoluble. As that product forms, it emerges, or precipitates, from the solution as a solid. This process is called precipitation, such a reaction is called a precipitation reaction, and the solid is called the precipitate.

In the given question the precipitation reactions involved are,

Ca(NO3)2(aq) + Na2CO3(aq) → CaCO3(s) + 2NaNO3(aq

                                                (ppt)

This is a precipitation reaction

Ca(NO3)2 + 2KIO3 → Ca(IO3)2 + 2KNO3

                                            (ppt)

This is a precipitation reaction

Thus the answer is 2 and 4

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