Lab 14

What’s in That Bottle?

Unit 5⏱ 90 minGuided Inquiry

Overview

How can you design a series of experiments and interpret data to determine unknowns based on bonding and intermolecular forces of attraction?

Objectives

How can you design a series of experiments and interpret data to determine unknowns based on bonding and intermolecular forces of attraction?
Connect observations to AP Chemistry models and calculations.

⚠️ Wear protective goggles and an apron. Follow your teacher’s safety directions for all chemicals and equipment.

Materials Needed

vials of unknowns Fischer Burner nichrome wire Test tubes distilled water stir rod Test tube wrack scoopula conductivity tester Small beakers hot plates well plate Aluminum boats HCl (for cleaning) magnet Wear safety goggles Always listen to your teachers instructions before during and after a lab

Procedure

You must develop your own procedure to figure out what solids you have been given.

Use the information from the introduction to help you identify unknowns.

You will not be able to determine the exact melting point of your samples; however, you can determine whether the melting point is high or low based on the amount of time and ease of melting of your samples.

Use hot plates for melting point and burners for flame tests.

When testing your samples, use small amounts.

Show your proposed procedure to your teacher before attempting the experiment yourself.

The following is a list of all of the possible solids that are in this lab.

Note that some of the substances below are hydrated: Sodium chloride (NaCl) Lithium nitrate (LiNO3) Calcium sulfate (CaSO4) Barium acetate (Ba(C2H3O2)2) Potassium chloride (KCl) Zinc powder (Zn) Copper (II) sulfate (CuSO4) Iron powder (Fe) Ferric chloride (FeCl3) Nickel (II) chloride (NiCl2.6H2O) Cobalt chloride (CoCl2.6H2O) Copper pellets (Cu) Salicylic acid (C6H4(OH)COOH) Dextrose (C6H12O6) Aluminum pellets (Al)

Pre-Lab Questions