Equilibrium Lab

Topics: Hydrochloric acid, Sodium chloride, Chemistry Pages: 3 (907 words) Published: September 16, 2014
Julie Nguyen
Equilibrium Lab
4-28-14

I. Purpose

To study the affect of temperature & concentration changes on systems in equilibrium

II. Safety

Wear apron
Wear goggles
Do not spill chemicals
Clean up after use
Wash hands
Chemicals are TOXIC (by Britney Spears)

III. Procedure
A. Iron-thiocyanate equilibrium
Pipet .3mL of 1 M iron (III) nitrate and .3 mL of 1 M ammonium thiocyanate. into clean 250 mL beaker. Add 75 mL of DS water. Mix well. Divide the solution into equal portions into four 6 inch test tubes. Number the test tubes (1-4). To tube 1, add 5 drops of DS water. Stopper this tube and invert it several times to mix it. Use this tube for as the control. To tube 2, add 5 drops of 1 M iron (II) nitrate. Put a cork stopper in tube and mix it by inverting it. Record color change. To tube 3, add 5 drops of 1 M ammonium thiocyanate. Mix. Record color change. To tube 4, add 5drops of 1 M ammonia solution. Mix. Record color change. B. Calcium oxalate equilibrium

Put 5 mL of .1 M calcium chloride and 5 mL of .1 M sodium oxalate into 6 inch test tube. Mix by stoppering and inverting. Equilibrium is established by formation of white precipitate. Add concentrated HCl. Shake after each drop. Record any changes. C. Cobalt chloride equilibrium

Heat 2 mL of saturated aqueous solution of cobalt chloride to boiling in a 6 inch test tube. Record the color before heating. Now place tube in ice water and record any color change.

IV. Data and Observations

A. Iron (III) thiocyanate equilibrium
Color of control: blood red
Color of 2: darker red
Color of 3: darker red
Color of 4: lighter red

B. Calcium oxalate equilibrium
Change observed: became clear after 3 drops of HCl
C. Cobalt (III) chloride equilibrium
Color before: fruit punch red
Color after: plum red/ condensation was blue
Color upon cooling: fruit punch red

V. Postlab Questions

1. Fe in the presence of hydroxide ions forms an insoluble gelatinous precipitate. Did...
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Chemical Equilibrium Essay
  • Chemical Equilibrium Research Paper
  • Rdr4 Chemical Equilibrium Essay
  • Essay about Study of Solubility Equilibrium
  • Common Ion Effect in Equilibrium Essay
  • Investigating Chemical Equilibrium Lab Essay
  • Le Chatelier's Principle and Chemical Equilibrium Systems Research Paper
  • Chemical Equilibrium: Le Chatelier Principle Essay

Become a StudyMode Member

Sign Up - It's Free
Höchster Preis | Intercultural Communication | Solo: A Star Wars Story