Preparing and Diluting Solutions, Colorimetric Determination of an Unknown by Bryan Dang

Video

bryand4489 — 2015-03-16 16:55:16 UTC

Graph

bryand4489 — 2015-03-16 16:55:31 UTC

Absorbance vs. Concentration (with Trendline and Equation

Pictures (5)

bryand4489 — 2015-03-16 16:55:53 UTC

ericm6861 — 2015-03-18 19:15:41 UTC

Test Tube

bryand4489 — 2015-03-18 19:15:53 UTC

Flowchart (Steps)

bryand4489 — 2015-03-19 16:37:08 UTC

Questions

bryand4489 — 2015-03-19 16:37:31 UTC

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%

Prepare test Tubes 1-5

ericm6861 — 2015-03-19 16:44:19 UTC

Fill cuvettes with solutions from test tubes #1-5

ericm6861 — 2015-03-19 16:44:31 UTC

Fill a 6th cuvette with distilled water (calibration)

ericm6861 — 2015-03-19 16:45:18 UTC

Connect the colorimeter to the SparkLink air

ericm6861 — 2015-03-19 16:45:43 UTC

Turn on the SparkLink Air and pair it to the iPad via bluetooth

ericm6861 — 2015-03-19 16:46:23 UTC

Insert the cuvette with water & press the green calibration button and wait for the green light

ericm6861 — 2015-03-19 16:46:58 UTC

Open SparkVue in the iPad

ericm6861 — 2015-03-23 15:02:23 UTC

Insert each of your remaining cuvettes and record the red absorbance from the live feed in SpakVue

ericm6861 — 2015-03-23 15:03:00 UTC

Obtain a cuvette of unknown concentration & record Abs.

ericm6861 — 2015-03-23 15:04:11 UTC

Data Table

ericm6861 — 2015-03-23 15:08:48 UTC

Colorimeter

ericm6861 — 2015-03-23 15:27:38 UTC

ericm6861 — 2015-03-23 15:31:23 UTC

ericm6861 — 2015-03-23 15:41:27 UTC

Absorbance

ericm6861 — 2015-03-23 15:42:37 UTC

Concentration

ericm6861 — 2015-03-23 15:43:01 UTC

Calculations

ericm6861 — 2015-03-23 15:45:50 UTC

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

Post Lab Questions

ericm6861 — 2015-03-23 15:49:40 UTC

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

10 mL Bottle

bryand4489 — 2015-03-24 15:12:32 UTC

Distilled Water

bryand4489 — 2015-03-24 15:14:30 UTC

Ipad

bryand4489 — 2015-03-24 15:16:04 UTC