Put 15 drops of dilute (6 M) sodium hydroxide (NaOH), into each test tube and allow them to stand for at least 1 minute. This prepares the glass surface for the Tollens’ test. **Safety alert** Dilute NaOH should be used carefully. It attacks the skin and is especially damaging to the eyes. If any gets on the skin or in the eyes, wash it off immediately with cool water.
Make sure you graph along the rigid side because fingerprints on the clear sides can mess up the readings. You then pipet the amounts of material listed in Table 1 of your lab manual, then shake the mixes thoroughly. Turn on you spectrophotometer and set the wavelength dial 540 nm. Allow the instrument to warm up for ten minutes. Then prepare the unknown sample by pipetting 1 ml of the unknown solution into the cuvette and mix with 1 ml of dilute ferric nitrate.
This involves a member of the team switching on every shower and tap in the building so that they run at the same time for around 5 minutes. This allows the pipes and tanks to be flushed through from any stagnant water that can cause Legionella. It is very important that these are physically carried out as if a member was harmed by this proof would need to be provided that these checks are being carried out. • As a manager our main responsibilities with regards to Health and Safety policy are to ensure that all our members of staff are trained in all areas of this section. This includes our staff being
Health & Safety at Work Module | | | By Brian Finn | | | Comprehensive Plan and Aims/objectives of survey. Plan The plan is to observe five members of the public washing their hands in a hospital Aims To observe peoples hand washing techniques to see if people are washing their hands correctly. Objectives By the end of the assignment the reader will be able to discuss the importance of hand washing, describe the risk of infection to patients and explain the importance of eliminating cross infection. Sufficient documentation/background information Hand washing is important to stop the spread of infection (see fig 1). On our hands we have normal bacterial skin flora which is found deep in the skins layer and under fingernails.
magnets zipper locking plastic bags beakers Petri dishes micro spatulas tongs 13- x 100-mm test tubes; rubber or cork stoppers to fit rings, ring stands, gauzes, burners, ignitors ice paper towels filter paper funnels Using this equipment, devise a procedure for the separation of the four substances. Design experiments, and write procedures for the designs. Ask the instructor to approve each experimental design. Questions Explain why the sodium chloride is contaminated with benzoic acid. Suppose sawdust from wood less dense that water were incorporated into the mixture.
Module 02 Written Assignment The Hazards in the Laboratory 1. Identify and describe the three links found in the chain of infection. * The Source * Mode of Transportation * Susceptible Host 2. Locate a MSDS for Sodium Hypochlorite in your student lab or online. Based on the MSDS, answer the following questions.
Specific Heat and Phase Changes Introduction: In these labs, we are learning mainly about the transfer of energy. In the Specific Heat lab, we learn about a metal and water’s ability to conduct and transfer heat/energy. What we did is drop the metal in water that is room temperature until the water+metal solution reaches its highest point in temperature. The second lab, we are dropping ice in coffee and watching the what happens along with the temperature. Also, we watched as the water boiled and made observations as the temperature as it started to boil.
Purpose The Purpose of this lab is to observe and discover how different chemicals and substances react with each other and how their physical and chemical properties change. Procedure Before beginning the experiment, I reviewed the instructions and the goals of the experiment and re -reviewed the safety procedures when conducting lab experiments After I prepared myself with the requirements, I laid out each item that was needed to perform the experiment- test tubes, bunsen burner, 100-Ml Glass Beaker, Stirring Rod, test tube clamp holder, cleaning brushes, 24 well plate, 96/well plate, blue litmus paper, red litmus paper, Copper (II) Carbonate, Copper (II) Nitrate Crystals, Copper Metal, Magnesium, Magnesium Oxide Powder, Sodium
READING ASSIGNMENT: ● This handout for procedure . ● Supplementary information in Janice Gorzynski Smith (2 nd ed), Chapter 22.11 PRE - LAB ASSIGNMENT : ● Complete all portions of pre - lab notebook work according to the guidelines. ● Rewrite the procedure in your lab notebook using your own words. ● Sapling assignment. CHEM 51LC Page 2 Rev 04 /30 /1 3 CAUTION Sodium hydroxide is corrosive and causes burns.
The final crude product yield was 0.91g and the pure product yield was 0.36g. Error may have occurred during the extraction phase. Although I extracted twice with Sodium Chloride, if waste was not completely removed, it would affect the purity of the product. The distillation process may have also affected the pure product. The lab manual recommended that 0.5mL of waste be removed during distillation; otherwise it would affect the purity of the product.