Essay on Laboratory Techniques and Measurements

2201 Words Dec 17th, 2011 9 Pages
Title

Laboratory Techniques and Measurements

Purpose

The purpose of this experiment is to determine mass, length, temperature, volume, and density of objects and liquids using common measuring devices and algebraic formulas. The metric system, the most common set of measurements used in science, which includes meters, liters, Celsius, and grams will be used.

Procedure
The following items were used within the experiment:
(1) Metric ruler with centimeter (cm) and millimeter (mm), (1) table salt, (1) small number of ice cubes, (1) piece of string, (1) isopropyl (rubbing) alcohol, (1) tap water, (1) distilled water, 25 mL, (1) paper, 5 cm x 5 cm for weighing chemicals, (1) colored drink, (1) beaker, 100 mL, glass (1)
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(NH4OH was used instead of NH3 because it was not available.)
An empty and distilled cleaned pipet was used to drop substances on the paper.

Observations / Data Table 1
Chemicals Well # Reaction on White Paper Reaction on Black Paper
NaHCO3
(sodium bicarbonate) HCL
(Hydrochloric Acid) A1 Mixture absorbed within paper within seconds; Clear bubbles appeared within the product; stained clear Clear bubbles within the product; Product was slow to absorb into paper; once substance was absorbed, the paper stained green
HCL
(Hydrochloric Acid) BTB
(bromthymol blue)a A2 Mixture beads on paper; Appears orange; Slow to absorb mixture; color changed green and dried yellow-tan with a green border
NH3
(Ammonia) BTB
(bromthymol blue) A3 Mixture absorbed within paper within seconds; appears blue Absorbed immediately; Appears blue
HCL
(Hydrochloric Acid) Blue Dye A4 Mixture absorbed within paper within seconds; Substance appears green Slow to absorb mixture; did not change color of paper; Dried Green and tan
Blue Dye NaOCl
(sodium hypochlorite) A5 Mixture absorbed within paper within seconds; Aquablue Slow to absorb mixture; Green with yellow border
**Forgot to add 1 drop of HCl
NaOCl
(sodium hypochlorite) KI
(potassium iodide) A6 Mixture absorbed within paper within seconds; Yellow Slow to absorb mixture; Yellow
Add 1 drop of
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