Formulas and Equations

1
Formulas and Equations
General Chemistry 101/102Laboratory
ManualUniversity of North Carolina at Wilmington
2
Formulas and Equations

• Purpose

• To learn the characteristic colors exhibited by
  ions in solution.
• To practice writing chemical formulas and
  balanced chemical equations.

3
Formulas and Equations

• Procedure (Part 1)

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

clear, colorless solution
Set 1

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

4
Formulas and Equations

• Procedure (Part 1)

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

Set 2
Set 3

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

5
Formulas and Equations

• Procedure (Part 2)

spot plate

• Add 3 drops of NaCl solution to a well in your
  spot plate. Now, add 3 drops of AgNO3 solution
  to the well containing the NaCl solution. Record
  your observations.

• Repeat the above procedure for the three
  remaining reactions.

6
Formulas and Equations

• Procedure (Part 2)

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

Record the page numbers and edition of the
Handbook you used.
Do NOT make marks in the Handbook!