What was color of F e³⁺ before staining?

• Colorless
• Faint yellow
• Faint pink
• Faint blue

Faint yellow

What was color of A g⁺ before staining?

• Faint yellow
• Colorless
• Faint blue
• Faint pink

Colorless

What was color of B i³⁺ before staining?

• Faint blue
• Faint yellow
• Colorless
• Faint pink

Colorless

What was color of C o²⁺ before staining?

• Colorless
• Faint blue
• Faint yellow
• Faint pink

Faint pink

What was color of C u²⁺ before staining?

• Faint blue
• Faint pink
• Colorless
• Faint yellow

Faint blue

What was color of F e³⁺ after staining?

• Burgundy/Brown
• Greyish
• Blue

Blue

What was color of A g⁺ after staining?

• Greyish or faint yellow
• Blue
• Burgundy/Brown

Greyish or faint yellow

What was color of B i³⁺ after staining?

• Blue
• Greyish/Yellow/Orange
• Burgundy/Brown

Greyish/Yellow/Orange

What was color of C o²⁺ after staining?

• Burgundy/Brown
• Greyish
• Blue

Greyish

What was color of C u²⁺ after staining?

• Blue
• Greyish
• Burgundy/Brown

Burgundy/Brown

What were the approximate R_f of the cations on the completed plate? Please use student data.

R_f Calculations of Cations:

R_f of Ag^+ = 0.0009

R_f of Co^2+ = 0.384

R_f of Cu^2+ = 0.512

R_f of Fe^3+ = 0.705

R_f of Bi^3+ = 0.876

R_f Calculations of Unknown Cation Mixture:

R_f of Unknown Cation Spot 1 = 0.0009

R_f of Unknown Cation Spot 2 = 0.386

R_f of Unknown Cation Spot 3 = 0.877

Show how one of the R_f values was obtained. (Show work with short verbal descriptions of numbers.) Please use Student Data.

R_f of Ag^+ = 0.01 cm (distance cation moved) / 11.00 cm (distance solvent moved) = 0.0009

Consider the slide pictured below. What ions are present in the unknown solution?

Screen Reader User: Image: Rectangular plate about 6.5 cm high. Horizontal line at 5.5 cm from bottom. Horizontal line 0.5 cm from the bottom marked with A g+, C o2+, C u2+, F e3+, B i3+ and Unk at regular intervals. Vertical ruler starts at 0 cm at horizontal line. A g+ = yellow dot on line. C o 2+ = grey elongated dot at 2 to 3 cm from line. C u2+ = orange dot at 2.5 to 3 cm from line. F e3+ = blue dot 3 to 3.5 cm from line. B i3+ = beige dot at 4 cm from line. Unk = orange dot at 2.5 to 3 cm from line and blue dot 3 to 3.5 cm from line. End of image.

Your instructor will give you instructions as what to do with this box. It may be used for bonus points, or for taking away points (for example late submissions) or for error analysis if something went wrong during the lab. If no instructions have been provided to you, please leave this box blank.

5% = 4