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"Golden Rain"

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by

Justin Okeke

on 28 March 2014

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Transcript of "Golden Rain"

Precipitation of Lead (II) Iodide
The purpose of this lab is to determine which of the solutions is the
"limiting reagent"
. This basically means the solution that is totally consumed when the reaction is done. The amount of product formed is limited by this reagent since the reaction cannot proceed further without it.
Purpose
Equipment
Lead (II) Nitrate
Potassium Iodide
Graduated Cylinder
2 beakers
Funnel
Filter Paper
Procedure
Prepare the right concentrations of Lead (II) Nitrate and Potassium Iodide.
Mix both solutions into one beaker (pour one into the other)
When the two liquids mix, a yellow solid forms.
When the reaction happens, filter it in order to get all the Lead (II) Iodide.
Normally the mass of the Lead Iodide would be taken, but we won't do that.
Why does this happen?
When
the two solutions
mix, a chemical reaction occurs. This chemical reaction creates a solid, (the yellow Lead Iodide) which is
insolubule
, which means it can't dissolve in a liquid. So we see the lead as a yellow powder in the liquid.

The liquid that the Lead Iodide is floating in is Potassium Nitrate. This is a product of the same chemical reaction that creates the lead Iodide.
by Justin Okeke
Citation
Sullivan, Randy. "Precipitation of Lead Iodide." University Of Oregon. UO Libraries Interactive Media Group, n.d. Web. 14 Mar. 2014.
Limiting Reagent
Potassium Iodide is the limiting reagent. It gets used
up faster than Lead (II) Nitrate, so the reaction stops
because there is no more Potassium Iodide to keep
going.
Full transcript