Lab Report Identifying Unknown Substances by Characteristic Properties Purpose: To identify the unknown substance by characteristic properties. Materials: * 30g white substance * thermometer * 40mL water * 4 evaporating dishes * stirring rod * balance * bunsen burner * graph paper * ring stand * pencil * safety goggles * 10mL graduated cylinder * beaker * 4 test tubes Procedure: 1.) Obtain your materials. 2.) Seperate your 40mL of water into 4 different test tubes, 10mL in each. 3.) Divide your 30g of white substance into the 4 test tubes evenly. You should put 7.5g into each test tube along with the water. 4.) Set up your apparatus as shown below: 5.) One at a time, place your test tubes in the water bath and heat the first test tube to 25 , the second to 50 , the third to 75, and the last to 100 degrees c. Remeber to stir with your stirring rod every so often. …show more content…
7.) After you have heated them to the right temperatures, pour the excess water into a dry evaporating dish. ( Be sure not to get any of the substance in your solution. ) 8.) Boil off the water, using the same apparatus as in step 4. 9.) Repeat steps 7 and 8 for the other 3 test tubes. 10.) Mass the evaporating dish and it's contents. 11.) Subtract the mass of the evaporating dish from the mass of the evaporating dish and it's contents. Multiply that number by 10 to get the solubilty in grams per 100 cm3 of water. 12.) Plot your graph and use the curve to identify what substance you had. Data Analysis: Temp: Mass of evap. dish: Mass of evap dish+contents: Mass of contents: Solubility g/100cm3 water 25c 67.75g 69.69g 1.95g
The purpose of the Unknown White Compound Lab was to identify the unknown compound by performing several experiments. Conducting a solubility test, flame test, pH paper test, ion test, pH probe test, conductivity probe test, and synthesizing the compound will accurately identified the unknown compound. In order to narrow down the possible compounds, the solubility test was used to determine that the compound was soluble in water. Next, the flame test was used to compare the unknown compound to other known compounds such as potassium chloride, sodium chloride, and calcium carbonate. The flame test concluded that the cation in the unknown compound was potassium. Following, pH paper was used to determine the compound to be neutral and slightly
We finally took 1ml of the 0.01% solution from test tube using the glucose pipette and adding it to test tube 4, we then used the H2O pipette and added 9ml of H2O to test tube 4 creating 10ml of 0.001% solution.
Forensic Science Introduction: Someone in a restaurant has suddenly fallen ill and a mystery powder has been discovered with the victim. As the chief investigator, your duty is to identify the mystery substance through a lab. In this lab, it will consist of five known compounds and one unknown compound. Your job is to distinguish which one out of the five substances is the mystery powder. To figure out the mystery matter you will have to compare their physical and chemical properties and match them with the appropriate compound.
2. Drop a gummy bear into each of your prepared beaker or cup and place the beaker or cup
When those steps are finished, the temperature is held at 20°C. In step one, the hot start is initiated by incubating the tubes for five minutes at 95°C and adding the water. 0.4 ul Taq DNA polymerase to each tube while disallowing the tubes to cool and without taking. time to mix the reaction solution after adding the Taq polymerase.
In my experiment, I will use an overall volume of 50 cm³ of 2moles of
filled a water bath with warm water at a temp of 35oC and placed the
Solid A was identified to be sodium chloride, solid B was identified to be sucrose, and Solid C was identified to be corn starch. Within the Information Chart – Mystery White Solid Lab there are results that distinguishes itself from the other 4 experimental results within each test. Such as: the high conductivity and high melting point of sodium chloride, and the iodine reaction of corn starch. Solid A is an ionic compound due to its high melting point and high electrical conductivity (7), within the Information Chart – Mystery White Solid Lab there is only one ionic compound which is sodium chloride, with the test results of Solid A, it can be concluded that is a sodium chloride. Solid B was identified as sucrose due to its low electrical
Wait until the water boils and record the temperature to make sure that it is 100 degrees
Put a label on each test tube. With a pencil, number each test tube from one to twelve.
The objective of this experiment was to identify a metal based on its specific heat using calorimetry. The unknown metals specific heat was measured in two different settings, room temperature water and cold water. Using two different temperatures of water would prove that the specific heat remained constant. The heated metal was placed into the two different water temperatures during two separate trials, and then the measurements were recorded. Through the measurements taken and plugged into the equation, two specific heats were found. Taking the two specific heats and averaging them, it was then that
In a 100ml beaker 30mls of water was placed the temperature of the water was recorded. 1 teaspoon of Ammonium Nitrate was added to the water and stirred until dissolved. The temperature was then recorded again. This was to see the difference between the initial temperature and the final temperature.
1. Obtain a clean, dry crucible and lid, then heat them for approximately 5 minutes over a Bunsen burner
2. In the large beaker, put water and boil it completely. After that, remove the beaker from heat. 3. Sample tubes (A-D) should be labeled and capped tightly.
g. of KI in 10 mL of water. Add the KI solution dropwise to the test