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A chemist who studies water samples did a demonstration of how to test for lead in water. She added a clear solution of potassium iodide to a clear solution of lead nitrate. Then a yellow swirling solid formed in the liquid.

What is most likely true about the yellow solid?
A.
It is solid lead nitrate.
B.
It is solid potassium iodide.
C.
It is a new substance with different properties.
D.
It was secretly added to the test tube by the scientist.

1 answer

The most likely true statement about the yellow solid formed in the demonstration is:

C. It is a new substance with different properties.

When potassium iodide (KI) is mixed with lead nitrate (Pb(NO₃)₂), a chemical reaction occurs, resulting in the formation of lead iodide (PbI₂), which is a yellow solid. This means that the yellow solid is a new substance with different properties from both potassium iodide and lead nitrate.