Allow the mixture to cool for a few minutes then filter it, using either gravity or vacuum filtration. (We shall be using vacuum filtration.) Wash the residue in the funnel once with a little water and collect all the filtrate. 4. Pour all the filtrate and washings into a 250cm3 volumetric flask.
Put that magnesium strips into the conical flask which contains 50 cm3 of 0.2 M hydrochloric acid. 6. Immediately close the conical flask with stopper and start stopwatch. 7. Record the volume of gas in burette in every 30 seconds for 5 minutes.
Then by writing a balanced chemical equation and using the titration formula, Nb+Ma+Va=Na+MbVb , the molarity is able to be determined. Procedure: 1) Using the graduated cylinder add 10.0 mL of water into the Erlenmeyer flask. 2) Add 5.0 mL of HCl into the flask using another graduated cylinder because acid goes into water when mixing them. 3) Add three drops of phenolphthalein indicator into the flask. 4) Swirl the flask in circular movements to mix the substances.
Once the buffer tablet has dissolved into the water, add 10 ml of starch solution. 3. After the starch solution has been added, add 10 ml of enzyme solution to the current solution, simultaneously start the timer and record at 1 minute intervals. 4. In addition, place iodine in the dropping tile in order to identify if starch is currently present.
The Determination of Keq for FeSCN2+ Purpose: To determine the equilibrium constant Procedure: Part I - Preparing the solution 1)Get 10 test tubes 2)Prep the 5 reference solution test tubes. Mix each solutions using a stirring rod. Standard Volume of .200M Fe(NO3)2 Volume of .00020M KSCN solution Reference Solution #1 8.0mL 2.0mL Reference Solution #2 7.0mL 3.0mL Reference Solution #3 6.0mL 4.0mL Reference Solution #4 5.0mL 5.0mL Reference Solution #5 4.0mL 6.0mL 3)Using he burets transfer the appropriate volumes of each reagent to make the test solutions. Sample .0020M Fe(NO3)2 .0020M KSCN Distilled Water Test Solution #6 5.0mL 1.0mL 4.0mL Test Solution #7 5.0mL 2.0mL 3.0mL Test Solution #8 5.0mL 3.0mL 2.0mL Test Solution #9 5.0mL 4.0mL 1.0mL Test Solution #10 5.0mL 5.0mL 0mL 4) Mix each solution using a stirring rod 5)Measure the temperature of one of the solutions and record. Part II - Spectral Analysis 1)Ensure that the instrument has had time to warm up for 15 min.
4. Any hanging drop was removed from the jet, and the sodium hydroxide was then drawn up using the pipette, to above the graduation mark and allowed to run into the sink. This process was the rinsing of the pipette. 5. Sodium hydroxide was again drawn up using the pipette, to above the graduation mark, where the meniscus was allowed to fall until the bottom of it was rested on the graduation mark when viewed at eye level.
Things that you can measure are: * How quick or how slow the colour of the solution changes. * The volume of gas made from the reaction. * How quickly a solid is formed. What factors can affect the rate of a reaction? There are four factors which affect the rate of reaction: temperature, concentration of the reactants, catalysts and the surface area of any solid reactant.
Benzophenone Harmful & Irritant Wash spillages away with water Hydrochloric acid Corrosive & Irritant wash spillages away with water. Introduction In this experiment, we will see the reduction of the aromatic ketone benzophenone with sodium borohydride to diphenylmethanol. The reducing agent is used in excess to ensure complete reduction of carbonyl group, and the reaction is carried out in aqueous ethanolic solution. The product is easily isolated, purified by crystalisation. By using TLC and IR spectrum, we will see the difference between benzophenone (starting material) and diphenylmethanol (final product).
Gravimetric Determination of Sulfate Purpose The purpose of this lab is to determine the percentage of sulfate in the hydrate by precipitating the sulfate as barium sulfate. Materials Filler paper Sodium sulfate Graduated cylinder Bunsen burner Watch glass Beakers (250 mL, 400 mL) Rubber bulb Graduated pipette Beaker tongs Funnel Filter Paper Sodium Sulfate Drying oven Wash bottle Stirring rod Silver nitrate Hydrochloric acid Distilled water Small test tube Procedures First, .4861 grams of sodium sulfate was placed into a clean 400mL beaker. Exactly 200mL of water and 1mL of HCl was added to the same beaker. A watch glass was placed on the beaker and the solution was heated using the Bunsen burner to a gentle boil. The watch glass was removed with the beaker tongs.
Take purified water to water testing station and record the data 13. Get rid of the remaining water and clean and put away all equipment Prelab Questions - 1. A.) Mixture is a blend of two or more kinds of matter and a compound is made of two or more elements that are chemically bound. B.)