CHM 101/102CHM 101/102

Laboratory ManualLaboratory ManualLaboratory Manual

Formulas and EquationsFormulas and Equations

General Chemistry 101/102General Chemistry 101/102Laboratory ManualLaboratory Manual

University of North Carolina at WilmingtonUniversity of North Carolina at Wilmington

CHM 101/102CHM 101/102

Laboratory ManualLaboratory ManualLaboratory Manual

Formulas and EquationsFormulas and Equations

• PurposePurpose To learn the characteristic colors exhibited by ions To learn the characteristic colors exhibited by ions

in solution.in solution. To practice writing chemical formulas and To practice writing chemical formulas and

balanced chemical equations.balanced chemical equations.

• Safety ConsiderationsSafety Considerations Rinse the contents of your spot plate into the Rinse the contents of your spot plate into the

proper container in the fume hood using your proper container in the fume hood using your wash bottle.wash bottle.

Thoroughly rinse your hands with plenty of water Thoroughly rinse your hands with plenty of water after handling any chemical reagent.after handling any chemical reagent.

CHM 101/102CHM 101/102

Laboratory ManualLaboratory ManualLaboratory Manual

Formulas and EquationsFormulas and Equations• Procedure (Part 1)Procedure (Part 1)

This exercise is done individually. Observe the This exercise is done individually. Observe the solutions that comprise Set 1. Record the name of solutions that comprise Set 1. Record the name of the compound dissolved in each solution and the color the compound dissolved in each solution and the color of each solution.of each solution.

Write the formulas of the compounds dissolved in each Write the formulas of the compounds dissolved in each solution. Have your instructor check your work and solution. Have your instructor check your work and initial your data sheet.initial your data sheet.

clear, colorless clear, colorless solutionsolution

Set 1Set 1

CHM 101/102CHM 101/102

Laboratory ManualLaboratory ManualLaboratory Manual

Formulas and EquationsFormulas and Equations

Repeat the procedure of recording names and colors Repeat the procedure of recording names and colors and writing formulas for Sets 2 and 3.and writing formulas for Sets 2 and 3.

Observe each of the four unknown solutions. Record Observe each of the four unknown solutions. Record the color of each solution and determine which ion(s) the color of each solution and determine which ion(s) could be responsible for the color of the solution.could be responsible for the color of the solution.

• Procedure (Part 1)Procedure (Part 1)

Set 2Set 2 Set 3Set 3

CHM 101/102CHM 101/102

Laboratory ManualLaboratory ManualLaboratory Manual

Formulas and EquationsFormulas and Equations

Add 3 drops of NaCl solution to a Add 3 drops of NaCl solution to a well in your spot plate. Now, add 3 well in your spot plate. Now, add 3 drops of AgNOdrops of AgNO33 solution to the well solution to the well

containing the NaCl solution. containing the NaCl solution. Record your observations.Record your observations.

• Procedure (Part 2)Procedure (Part 2)spot platespot plate

Write a balanced chemical equation for the reaction Write a balanced chemical equation for the reaction you observed. Indicate the color of the precipitate.you observed. Indicate the color of the precipitate.

AgNOAgNO33(aq)(aq) + NaCl + NaCl(aq)(aq) AgCl AgCl(s)(s) + NaNO + NaNO33(aq)(aq)

(white)(white)

Repeat the above procedure for the three remaining Repeat the above procedure for the three remaining reactions.reactions.

CHM 101/102CHM 101/102

Laboratory ManualLaboratory ManualLaboratory Manual

Formulas and EquationsFormulas and Equations

Use the Use the Handbook of Chemistry and PhysicsHandbook of Chemistry and Physics to look to look up the up the crystalline formcrystalline form and and melting pointmelting point of each of each precipitate formed in your chemical reactions.precipitate formed in your chemical reactions.

• Procedure (Part 2)Procedure (Part 2)

Record the page numbers and Record the page numbers and edition of the edition of the HandbookHandbook you you used.used.

Do Do NOTNOT make marks in the Handbook! make marks in the Handbook!