Density determination of an unknown liquid Procedure The density of a substance is a measure of its mass per unit volume. The Mark II Abbe Refractometer is equipped with fittings that allow temperature controlled water to pass around the prisms.
Record that on the Data Sheet as the observed index of refraction nDT This is the view through the eye piece.
Heating the liquid in the test tube by heating a beaker with water provides a much more even heating of the unknown liquid than heating the test tube directly with the Bunsen burner.
Some first aid for organic liquid skin exposure not only includes flushing with water but also applying anti-bacterial creams because skin without these oils is more susceptible to bacteria.
Using water in the beaker works because the unknown liquids in this experiment boil below the boiling point of water. To read more about the incident visit: The refractive index index of refraction for water is 1. Repeat with a The display will digitally indicate the actual temperature of the measuring prism and sample.
Again, using this experimental boiling point value, eliminate unknown possibilities that have boiling points far from this determined value. It turns out we can, and rather easily!
The colors of fireworks result from jumps of electrons from one shell to another. They will easily break if you try to move them. Record the temperature at which the liquid in the test tube boils freely, then remove the burner.
Sometimes they are white.
For general instructions for using the refractometer, see the following panels. Adjust the liquid level so that the thermometer bulb is about 1 cm above the surface of the liquid. Using a Pipette Tutorial Replace the stopper avoiding any contact between the stopper and the liquid.
The pressure in the room was Now you can read the thermometer to get the boiling point of your unknown liquid. The shadow is the dark area. Energy levels or "shells" exist for electrons in atoms and molecules.
When all else falls, ask a peer for chemistry help reach out to a chemistry tutor! But how do we determine which tube contains KI and which tube contains NaCl?
At the back of the refractometer are the two prisms. Rotate the eyepiece to bring the crosshair into focus. For references we used our textbook, lab manual, and the Chemical Handbook found on shelf 2 of the library behind the reference desk.
Refractive index measurements can be used to determine solution concentrations, ascertain purity and identify a compound.
The green neoprene stoppers used here are more resistant to solvents, but getting an unknown liquid on the stopper should be avoided from that standpoint and the fact that you could loose some of the mass of the liquid from evaporation off the sides of the stopper.
Never wipe a dry prism surface with a dry Kimwipe. The test tube should be immersed in the beaker of water so that the unknown liquid is below the water level but the thermometer bulb is above the water level.
It can be in the form of light, an electric discharge or heat. Be sure to read the thermometer correctly. Remove from heat and measure the temperature as accurately as possible using your laboritory thermometer.
In veterinary medicine a refractometer is used to measure blood plasma protein. That way when the burner lights, your fingers will be below the flame. Keep them away from all flames. In addition to boiling freely, look at the top of the test tube for condensation on the glass tubing. One or the other ought to be wet with a liquid.1 Experiment 2: What Is It?
Identifying an Unknown Compound Pre-Laboratory Assignment 1. Outline the procedure that should be followed for testing the solubility of a. Using Flame Tests to Identify Unknowns. Valerie Stecher Students will investigate how the electromagnetic spectrum can be used to identify the unknown composition of a Colorflame flame is not indicative of sodium unless it persists and is not intensified by addition of 1% NaCl to the dry compound.
White. White-Green: Zinc. Green. An Introduction to Functional Groups in Organic Molecules Portions of this experiment were adapted from Lehman, J. W., Operational Organic Chemistry, Based on the functional group tests, identify your unknown compound by choosing it from the following possible unknowns: 1-bromobutane, 2-butanone, cyclohexene, 1-butanol.
Experiment 5: Identification of an Unknown Ionic Compound. 2 typically is obtained through chemical reaction of Limestone found in caves and caverns Identification of an Unknown Ionic Compound Experiment 5 Unknown 8: Odor Test: No Odor Thus we determined that we will need to identify our unknown using the other tests.
Results Explosives. 1# # Lab$QualitativeOrganicAnalysis$ Written’by’ Danielle’M.’Solano’ Department’of’Chemistry’&Biochemistry’ California’State’University. Identification of Unknown Solutions INTRODUCTION In this experiment, the student will determine if a chemical reaction has taken place when two Identify what your unknown solutions were (claims) and describe the evidence you used to support these claims.
You should also use this section to.Download