# data[].attributes.body
3. The darker the solution, the more concentration it has, and the lighter it is, the less concentration

4. The more concentrated the solution the less absorbent it is

6. It is important to include (0,0) because it shows the first relation between absorbency and concentration

8. According to the graph, the unknown concentration of copper sulfate was estimated to be .05 M

# data[].attributes.body
Test tube #2

0.150MX3.80mL=10.0 mL X M

M =.057M

Test tube #3

0.150M x 2.40 mL=10.0mL X M

M=.036

Test tube #4

0.150M X V=.075M X 10.0mL

V=5.00mL

Test tube #5

0.150M X V=0.023M X 10.0 mL

V=1.5mL

# data[].attributes.headline
Obtain a cuvette of unknown concentration & record Abs.

# data[].attributes.subject
Obtain a cuvette of unknown concentration & record Abs.

# data[].attributes.headline
Insert each of your remaining cuvettes and record the red absorbance from the live feed in SpakVue

# data[].attributes.subject
Insert each of your remaining cuvettes and record the red absorbance from the live feed in SpakVue

# data[].attributes.headline
Insert the cuvette with water & press the green calibration   button and wait for the green light

# data[].attributes.subject
Insert the cuvette with water & press the green calibration   button and wait for the green light

# data[].attributes.headline
Turn on the SparkLink Air and pair it to the iPad via bluetooth

# data[].attributes.subject
Turn on the SparkLink Air and pair it to the iPad via bluetooth

# data[].attributes.headline
Connect the colorimeter to the SparkLink air

# data[].attributes.subject
Connect the colorimeter to the SparkLink air

# data[].attributes.headline
Fill a 6th cuvette with distilled water  (calibration)

# data[].attributes.subject
Fill a 6th cuvette with distilled water  (calibration)

# data[].attributes.headline
Fill cuvettes with solutions from test tubes #1-5

# data[].attributes.subject
Fill cuvettes with solutions from test tubes #1-5

# data[].attributes.body
1) Using your trendline equation calculate the concentration of the unknown solution

.178=4.7976(concentration)+0.0298= .0309 M

2) Calculate your % error based on the unknown concentration of 0.0341M

(.0309 M/ 0.0341 M ) *100 = 90.6%

# data[].attributes.body
Absorbance vs. Concentration (with Trendline and Equation