Double-Displacement Reaction Lab

Double Displacement Reaction

Rehan Muhammad

Justin MacEachern

Chemistry 521A

Tuesday December 4, 2012

Mrs. Waite

Objective

The objective of this lab experiment is to observe and determine the results of a double displacement reaction between Pb(NO3)2 and KI. And to see if the theoretical yield of 1.10g will be the same as the actual yield.

Introduction

Stoichiometry is the math behind chemistry (Shodor). It can help you find masses, moles, and percent’s all within a chemical equation. In this lab a double-displacement reaction will take place. A double-displacement reaction is when two different compounds switch ions to make new compounds (Costello). Percent yield is what yield you actually get from the lab (Helmenstine). Theoretical yield is the yield you should be receiving in theory. The limiting reactant is the reactant that limits the experiment from creating more products. The excess reactant is the reactant that you have an excess amount of, and after the reaction still have some left over. My hypothesis is that there will be 1.10g of product after these two reactants react with each other.

Materials

* 0.85g lead (II) nitrate

* 0.79g potassium iodide

* (2) 100ml beakers

* filter paper

* O-ring

* stand

* funnel

* safety equipment

* digital scale

* glass stir stick

* distilled water (approximately 100ml)

* watch glass

* plastic spoon

Procedure

Collect and wear the proper safety equipment (safety goggles, lab coat, gloves, etc.). Place one of the 100ml beakers on the digital scale. Press the “ZERO” or “TARE” button to account for the weight of the beaker. After pressing the button wait for the scale to go to 0.00g. For the next step it is important to be wearing gloves, lab coat, and safety goggles. Once the scale is at 0 take the plastic spoon and place 0.75g to 0.90g of lead (II) nitrate in the beaker. Once that is done, carefully pick up the beaker...