During chemistry, Dan mixes two clear, colorless solution and mixing them produces a yellow precipitate in a clear, colorless fi

Question

4 years ago

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During chemistry, Dan mixes two clear, colorless solution and mixing them produces a yellow precipitate in a clear, colorless fi

nal solution as shown by the chemical equation.
Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq)

What physical evidence indicates that there has been a chemical reaction?

Chemistry

1 answer:

Andrei [34K] · Answer 1 · 2022-02-20T02:29:01+03:00

Answer: Formation of precipitate indicates that there has been a chemical reaction.

Explanation:

Chemical reaction: It is defined as change in arrangement of the atoms so as to form a new substance.

Mixing of two clear solutions that is lead nitrate and potassium iodide gives out yellow solid precipitate of lead iodide with aqueous solution of potassium nitrate.

$Pb(NO_3)_2(aq)+2KI(aq)\rightarrow PbI_2(s)+2KNO_3(aq)$

The physical evidence which indicates that chemical reaction has been taken place is formation of yellow solid precipitate of lead iodide ,( $PbI_2$ ).