Allow the crystals to dry for 1 week then, weigh it, take a MP, and calculate the % yield. * Assemble the apparatus for reflux using the diagram (see figure 1), place boiling chips or a stirring bar in the bottom of the flask. * Weigh 2grams of finely ground nutmeg and combine with 10ml of diethyl ether in a 50ml round bottom flask. * Place a heating mantle under the round bottom, turned on and the heat was slowly adjusted until the mixture starts to boil for 45minutes, then let cool to room temperature by sitting it on the lab bench. * Pour a little ether over the nutmeg residue on the filter paper so that any Diethyl ethanol traces clinging to it is washed down and mixed with the filtered liquid underneath.
Diffusion and Osmosis Lab Part 1A: Diffusion Evidence: Table 1: The Color of Different Solutions Before and After Diffusion for 30 Minutes Content | Initial Solution Color | Final Solution Color | Bag15% glucose1%starch | Cloudy white | Very dark purple | BeakerWater + IKI | Golden yellow | Golden yellow | The above table represents the final and initial colors of the solution that was inside of the dialysis tubing and the solution that was in the beaker. A 15% glucose and 1% starch solution was placed inside of the dialysis tubing. The initial color of the solution in the bag was a cloudy white but after 30 minutes of sitting in the beaker of water and IKI the color turned a very dark purple almost black. Inside of the beaker was a water and IKI solution. After sitting for 30minutes this solution stayed the same color.
About 125 mL of standard HCl with a molarity of 0.3125 and was poured into a buret. An unknown sample of soda ash was obtained, and for each trial, a little over 1 g of the soda ash was quantitatively transferred into a wide mouth Erlenmeyer flask. About 75 mL of DI water and 5 drops of methyl purple indicator was then added to the soda ash powder. The solution was titrated once until the solution turned light purple, and then the flask was put on the hotplate for about 3 minutes of gentle boiling. After, the solution was titrated once more in order to reach the endpoint that was indicated by a bullfrog green color.
• Next, I added 25mL of absolute ether and attached a reflux condenser to the flask. I turned on the water when I saw ether vapor had successfully wet the joint at the top of the condenser. • Every 60 seconds, I swirled the flask and I continued to perform this action until I saw that the reaction
In this report I will be looking at the effect of temperature in the solubility of sugar (sucrose) in water when it dissolve in different temperature of water and how long it takes to dissolve. I will also use different scientific explanations to support my findings. In order to do this this experiment I have used three different variables which are:- * Independent (temperature) * Dependant( time taken to dissolve) * Control ( volume of solvent and volume of solute) Equipment needed for the experiment is * 100 ml beaker * Sucrose (sugar) * Timer * Tea spoon * Kettle with boiling water * Thermometer * Ice cubes The methods of this experiment are as follows * First I will boil the water at 100 degree and then put the required amount of boiled water in the beaker. * Use thermometer to measure the temperature and record and then add the required amount of solute and start the timer and stirring until it completely dissolves. * Document the time it takes .I will repeat the process three times and take the average amount of time it took for the solute to dissolve in the solvent of high temperature.
We rinsed a pipette with some of the sample, filled curettes between 2/3 and 3/4 full with the samples, put a curette in the cell holder and make absorbance measurements. If we see the absorbance of the sample run out off the computer screen. That means it is too concentrated so we need to get some dilution of the sample. To dilute it, we took 1mL of the stock reference sample and dilute with water until the intensity is less than the stock reference sample. Measure the new sample volume.
First, we had to calculate how many grams of copper (II) sulfate we needed to form 100 mL of a 0.200 M solution of copper (II) sulfate. We determined that we needed to use 4.994g of copper (II) sulfate to make the solution. We added distilled water to the 4.994g of copper (II) sulfate in a beaker until it reached 100 mL. Then we put the beaker on a hot plate and added a magnetic stirrer. We determined that the mass of zinc necessary to completely react with the copper (II) ions in the solution was 1.308g.
Controlled The controlled variables of the experiment were: A. The volume and concentration of the Hydrochloric acid. B. The concentration of the Sodium Hydroxide. Equipment List * Boiling Tube * 10 cm3 1mol dm-3 Hydrochloric Acid (HCL) * 15 cm3 1mol dm-3 Sodium Hydroxide (NaOH) * pH and Temperature Probes * Data Logger * Measuring Cylinder ‘ * Boiling Tube * Teat Pipette Method * Add 10ml of Hydrochloric acid, measured in a measuring cylinder, into a boiling tube.
Stoichiometry of Reactions in Solution Lab 18 September 2013 Introduction: In the following lab, quantitative titration reactions will be completed and the mole ratios will be calculated. Using four different chemicals, two acids, hydrochloric acid (HCl) and sulfuric acid (H2SO4), and two bases, sodium hydroxide (NaOH) and barium hydroxide (Ba(OH)2.) will be combined to see the mole ratio of the chemicals. The following four equations will be the key equations to the lab. HCl + NaOH → H2O + NaCl H2SO4 + 2 NaOH → 2 H2O + Na2SO4 H2SO4 + Ba(OH)2 → 2 H2O + BaSO4 2 HCl + Ba(OH)2 → 2 H2O + BaCl2 Using a buret and the indicator phenolphthalein, it will be visible when the solution reaches the point when the ratio is correct for the reaction to start.