Obtain 6 clean/dry test tubes and arrange in your test tube rack. Label the test tubes 1,2,3,4,5,&6 6a. Test tube 1: Add 5 drops of Barium nitrate solution. Test 2: Add 3 drops of Sodium chromate solution. Combine test tubes 1 and 2 into one test tube (pour test tube into test tube 1).
I inserted the digital thermometer into the test tube and took reading every 30 seconds until the readings remained constant. The readings for the distilled water did not change. I then placed the test tube in the beaker’s ice water bath and set the stopwatch at zero. I carefully stirred the water in the test tube with the thermometer and recorded the temperature of the water at 30-second intervals. Data Table 1: Pure Water Time in seconds | Distilled H2O Room Temp | Distilled H2O Ice bath | 0 | 2431o C | 24.3o C | 30 | | 4.8o C | 60 | | 0.7o C | 90 | | -0.4o C | 120 | | -0.8o C | 150 | | -.10o C | 180 | | -.10o C | Data Table 2: Salt Solution Time in seconds | Salt Water Room Temp | Saltwater Ice Bath | 0 | 20.8O C | 14.2o C | 30 | | 3.0o C | 60 | | 0.2o C | 90 |
4) Ignoring step 3, after step 2, you can take the solution that you have created and pour it into a 100 mL beaker. Once the solution is in the beaker, turn on the conductivity tester and gently place it in the solution (try not to touch the bottom of the beaker). Record the results. 5) Now, take the beaker with the solution already inside and place it on a hot plate. Turn on the hot plate to a medium heat.
Take extreme care to see that the electrodes are not damaged by the stirring bar or by rough treatment. Titrate the dissolved unknown sample with 2 M HCl, recording the burette readings and the pH at frequent intervals throughout the titration until solution reaches pH
Molar Volume of a Gas PRE-LAB DISCUSSION Avogadro’s hypothesis states that equal volumes of all gases contain equal numbers of molecules under the same conditions of temperature and pressure. It follows from this hypothesis that all gas samples containing the same number of molecules will occupy the same volume under the same conditions of temperature and pressure. A special name is given to the volume occupied by 1-mole samples of gases at STP. This volume is called the molar volume. In this experiment, you will make an experimental determination of the molar volume.
Experiment 2 Time | Observations | 5 minutes | Bubbled like sugar | Once salt water was added | Turned soapy white and thick | Equation: METHOD 1) Put 2 cm3 of castor oil into a 250 cm3 beaker and add 10 cm3 of 5mol.dm-3 sodium hydroxide from a measuring cylinder. (Take care when measuring this out and adding it to the beaker to avoid any drips and spills.) 2) Heat the mixture gently over a tripod and gauze, STIRRING CONSTANTLY with a glass rod (otherwise the mixture erupts). Allow to simmer (boil gently) for 5 minutes. Steady the beaker using
Objective The objective of this lab is to find the formula of an ionic compound. Materials: Copper Chloride Iron Chloride Sodium Hydroxide Well plate Indicator Toothpicks safety goggles pipets Procedures - collect materials label pipets according to the solutions inside. (CuCl, FeCl, NaOH, and the indicator) Using the pipet with the CuCl place 5 drops in the 5 wells in the well plate. Place one drop of indicator in those 5 wells. Starting on the 1st well place one drop of the NaOH at a time and mix with a toothpick until the NaOH has dissolved.
Purpose: The purpose of this lab is to investigate whether mass is gained or lost during a chemical reaction. Hypothesis: It will be found out that the mass is neither gained nor lost during a chemical reaction but transferred. Materials: * Safety goggles * Erlenmeyer flask * Balance * Graduated Cylinder * Beaker * Iron (III) chloride solution * Copper (II) sulphate solution * Sodium bicarbonate * Test tubes (small, and large) * Rubber Stopper * Tweezers * Paper towel * Scoopula * Sodium hydroxide solution * Hydrochloric acid Procedure: 1. 5ml of iron (III) chloride was measured and placed in the Erlenmeyer flask. 2.
Once the solution is clear, retrieve at least ten drops of the solution and place them in a new test tube. 5. Add the same number of drops of NaOH to the solution in the new test tube. 6. If a precipitate forms, record your results including a chemical
Water would not change in mass because it is isotonic to its surrounding. By inserting these six dialysis bags filled with 25 mL of each solution into beakers of distilled water, we were able to see if there was the process of osmosis, if any. Before putting the six different dialysis bags into the solution of distilled water, we meticulously measured the mass of each bag. This was critical because we needed the initial mass in order to find the percent change in mass. After waiting for 30 minutes sharp, we measured the bags again and saw significant increases in mass for five out of the six dialysis bags.