Golden Rain

In chemistry, "golden rain" typically refers to a chemical reaction known as the "golden rain experiment" or the "golden rain reaction." This reaction involves the formation of a vibrant yellow-orange precipitate of lead(II) iodide (PbI2) when potassium iodide (KI) is added to a solution of lead(II) nitrate (Pb(NO3)2). The yellow color of the precipitate gives the reaction its distinctive appearance, resembling golden rain.
Here's the balanced chemical equation for the reaction:
Pb(NO
3
)
2
(aq)
+
2
KI (aq)
→
PbI
2
(s)
+
2
KNO
3
(aq)
Pb(NO
3
​
)
2
​
(aq)+2KI (aq)→PbI
2
​
(s)+2KNO
3
​
(aq)
In this reaction:
Lead(II) nitrate (
Pb(NO
3
)
2
Pb(NO
3
​
)
2
​
) is a colorless solution.
Potassium iodide (
KI
KI) is also a clear solution.
When these two solutions are mixed, lead(II) iodide (
PbI
2
PbI
2
​
) is formed as a yellow-orange precipitate. This reaction is often used as a demonstration in chemistry laboratories due to its visually striking result.
It's important to note that lead compounds can be toxic, and appropriate safety measures should be taken when conducting any experiments involving lead-containing substances. Always follow proper laboratory protocols and safety guidelines.