Intermediate Inorganic Lab Experiment 1: Preparation of Sodium Peroxoborate The experiment is designed to form the salt of a peroxy acid (sodium peroxoborate) from a salt (sodium borate) and hydrogen peroxide. The chemicals needed for the experiment are as following: 4.75 g. sodium borate, 1.0 g. NaOH, 5.75 mL of 30% sodium hydroxide, 12 mL of 0.1M HCl, 10 mL of 0.1N KMnO4, 0.2 g. KI, 5 mL of alcohol, and 5 mL of ether. The only required equipment is a 150 mL beaker, 125 mm test tubes, a Buchner funnel, filter flask, and an ice bath. Prepare sodium metaborate by dissolving 4.75 g. of borax (sodium borate) and 1.0 g. of sodium hydroxide in 20 mL of warm water. It may take a while for the sodium metaborate to dissolve, so in the meantime measure out 5.75 mL of hydrogen peroxide and chill in an ice bath. Once the NaBO2 has completely dissolved, put the flask in the ice bath. Dilute the chilled hydrogen peroxide with 15 mL of deionized water. Slowly add the diluted hydrogen peroxide dropwise while stirring. After all of the H2O2 is added, continue to stir for about 15 minutes. Filter the crystals by suction using a Buchner funnel and wash with 5 mL of alcohol, then 5 mL of ether. Weigh the product. Weigh out two 0.100 g. samples of the product and put each into a test tube. Add 6 mL of 0.1M HCl to the first test tube, then 0.1M KMnO4 and record results. To the second test tube also add 6 mL of 0.1M HCl. Make a solution of 0.165 g. of KI in 10 mL of water. Add the KI solution dropwise to the test tube and record results. I started with 4.750 g. of borax, and produced 9.119 g. in product. The product, NaBO3H2O, was a fine, white powder. My percent yield was 79.0%. In the section where you add HCl and KMnO4, the HCl dissolved the solid and when the KMnO4 was added, the test tube was covered
Each subsequent trial will use one gram more. 2.Put baking soda into reaction vessel. 3.Measure 40 mL vinegar. 4.Completely fill 1000 mL graduated cylinder with water.
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.
neutralize 35ml of our base. Once we weighed out the KHP we then dissolved it
In my experiment, I will use an overall volume of 50 cm³ of 2moles of
Pipet out 10 µl aliquot of above mixture onto center of a Kapton disc. Dry at room temp. in glass petri plate
To make the test fair I will use the same amount of water and the leaf
* Make sure each test tube is exactly the same size, I will do this by
By doing this I will receive more accurate results and therefore draw up a more accurate conclusion. I will also use 20 ml of each solution and
Exactly 8.0cm3 of deionised water was added to the boiling tube containing the potassium nitrate. This was done by using a burette. 3. The tube was then heated gently until the crystals were dissolved and then the heat source was removed.
Put 1mL of 0.1M cobalt (II) chloride hexahydrate dissolved in 95% ethanol into a test tube. Then add 1mL of deionized water. Tap the end of the test tube to mix the solution and record the pertinent data in section 2 of the Data Table. Discard the solution in the appropriate container as directed to you by your lab instructor.
1. 3mL of water was added to 2r.g. of KCNS in the test tube and it
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.
== § Test tubes X 11 § 0.10 molar dm -3 Copper (II) Sulphate solution § distilled water § egg albumen from 3 eggs. § Syringe X 12 § colorimeter § tripod § 100ml beaker § Bunsen burner § test tube holder § safety glasses § gloves § test tube pen § test tube method = == = =
b. Drop Calculations Vol/Number of Drops. 1mL/23Drops =.034mL /drop VII. Conclusion Unlike other labs, this lab allows for the most precise titration. results possible.
In this experiment the Sodium Hydroxide solution went through three different phases where its quality and quantity changed. The first phase was called I. Preparing Approximately 0.1M NaOH, 1000mL of clear distilled water was boiled and then chilled to room temp.