Repeat step 5, raising the degree by 3® each time until you reach 30 ® C. After every 3® increase, count number of breaths for 60 seconds. Record data Data: Temperature °C | Fish # 1 | Fish # 2 | Fish # 3 | Fish # 4 | Fish # 5 | Fish # 6 | 3°C | 0 | 5 | 4 | - | - | - | 6°C | 0 | 6 | 11 | 4 | 29 | 15 | 9°C | 53 | 1 | 53 | 38 | 59 | 28 | 12°C | 59 | 19 | 57 | 67 | 75 | 39
Collect 6 grams of copper (II) sulfate on weighing paper. Weigh and record. 5. Collect 50 mL of distilled water into the beaker. 6.
Pre Lab Objective: The purpose of this lab is to obtain the mass and volume of two different metal samples, to graph data, to obtain the slope of graphed data and to display a best fit curve of experimental data in order to graphically determine the density of each metal Background: Understanding the relationship that exists between a substance’s mass and its volume. This relationship is expressed by the physical property called density. (D = M/V). In order to determine the volume of solids, a technique called water displacement is used. A fixed amount of water is added to a graduated cylinder and the volume of water is recorded.
Experiment 8 DETERMINATION OF % COMPOSITION OF PENNIES USING REDOX AND DOUBLE DISPLACEMENT (PRECIPITATION) REACTIONS Introduction: The main purpose of the lab is to determine the percent composition of pennies using oxidation reduction and double displacement reactions and titration techniques. The quantitative determination of zinc is conducted by precipitation followed by isolation and weighing of the Zn(OH)2 precipitate (gravimetric analysis). My expected results were that 97.5% of the penny would be zinc, and 2.5% would be copper. Experimental Procedure: 1. Obtain beaker filled with 250 mL of HCl and 5 pennies.
Next, obtain a 5 mL serological pipet and thoroughly rinse it with the buffer solution, then discard the buffer solution into the 250 mL beaker. Now, use the pipet to distribute 5 mL of the buffer solution into three 50 mL beakers. Be sure that the 50 mL beakers have been cleaned are dried prior to this. Next, locate the three pre filled burets in the lab room. Find the buret labeled 1.0M HCl and add exactly 1.00 mL of HCl to just one of the three 50 mL beakers with buffer solution already in them.
A cuvette block, four cuvettes, three 50 mL beakers, one 150 mL beaker, and one 5mL pipet were obtained. The phosphate buffers NaH₂PO₄ and Na₂HPO₄ were procured weighing .4060g and .4106g respectively. The phosphate buffers were then transported to the 150mL beaker. Next 50mL of distilled water was measured using a graduated cylinder and added to the 150mL beaker. Twenty drops of bromothymol blue was also added to the 150mL beaker.
Materials & Methods Identifying the unknown compound solution (#2314) first required the identification of each individual solution. One drop of each solution was added to five individual wells of a spot plate. Next, three drops of 3M hydrochloric acid (to be referred to from now on as HCl). The spot plate was then cleaned, and the procedure above was recreated two more times, the second test done by adding 3M ammonium hydroxide (NH4OH), and the third by adding 1 drop of dimethylglyoxime (DMG). All color observations were recorded and compared to the known behaviors of the focus metals.
Transform the data into the a graph- Cumulative Mass of zinc in grams (y-axis) vs cumulative displaced water in mLs (x-axis) Confidence Report- My partner and I are very confident in our results gathered during is lab. The density of the zinc found during the experiment was 7.0 g/mL. This value is very close to the value stated in the CRC Handbook of Chemistry, which is 7.14 g/mL. As for our materials, the beakers and graduated cylinders where cleaned thoroughly to prevent contamination in our observations of zinc and iodine. The test-tubes used for the solubility tests of zinc and iodine were washed and dried as well.
Read the absorbance at 20 second intervals from the start of the mixing. Then record your measurements on the table. After two minutes remove the tube from the spectrometer and visually note the color change. 6) Now mix the contents of tubes 4 and 5, transfer to a cuvette, and repeat your measurements for two minutes at 20 second
The cations used were K+, Fe3+, Zn2+, Cu2, and Co2+. The first elimination test was metal hydroxide test where all five cations are used. 10 drops of each cation are placed in a centrifuge tub. 6M NaOH was added to each tube dropwise until a precipitate was formed. One cation is to be eliminated.