Lab #6: Solution Chemistry Purpose: to determine the percent yield of a double displacement reaction

Materials:. 25M NaOH. 1. 00M Cu(NO3)2 5 mL pipette Materials: 0.25M NaOH 1.00M Cu(NO3)2 5 mL pipette funnel filter paper Erlenmeyer flask 100 mL graduated cylinder Procedure: Using a graduated cylinder measure 50 mL of 0.250M NaOH and pour into a 250 mL beaker Using a 5 mL pipette, measure exactly 3.00 mL of 1.00 M Cu(NO3)2 and add to the beaker. Mix well. Filter the precipitate and leave overnight to dry

Calculations and Discussion Questions: 1) Determine the number of moles of each reactant added to the mixture. 2) Create the balanced equation for the reaction between NaOH and Cu(NO­3)2 including states. 3) Prove that NaOH is in excess. Why was it not necessary to be exact when measuring the volume of NaOH but it was when measuring the volume of Cu(NO3)2? 4) Determine the theoretical yield of precipitate and then calculate your percent yield and percent error. 5) Based on your percent yield, discuss a source of error that is reasonable.

Lab Write up This will be a formal lab write up. If you are unsure of what this should look like, check out Science Lab Reports on the Grade 11 website. Marks will be assigned for the format of the lab report, the observation table that you have created for your results, significant digits, units and how well you are communicating your answers.