Place temperature probe through hole in cardboard lid and position probe about 1cm above bottom of calorimeter 15. Obtain an exact mass of hot water (~50mL) d. Should be approx. 45-60C above room temperature 16. Record temperature of cold water and hot water immediately before mixing the two. 17.
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.
Fill a 10 mL graduated cylinder with ≈ 7mL if water c. Fill a 1000 mL beaker with ≈ 750 mL of water d. Invert the graduated cylinder into the beaker. Add water to the beaker to completely submerge cylinder. e. Measure the difference between the height of the water in the graduated cylinder and the height of the water in the beaker. f. g. Record the barometric pressure in mmHg. Heat the water via Bunsen burner to 80°C.
Record the combined weight 4. Determine the weight of the water by subtracting the empty beaker weight (step 1) from the weight of the beaker plus 50 ml of sea water (step 3) 5. Place beaker on hot plate and evaporate most of the water. Record the time and temperature at which the seawater begins to boil. As the water is being evaporated, record the temperature every 2 minutes.
Acid Base Titration Purpose: The purpose is to calculate the molarity of a NaOH solution by titrating the base with 5mL of standard HCl solution in each trial. By adding the base with unknown molarity to the acid with 0.10M the molarity of NaOH can be calculated. The base, NaOH, helps bring the pH of the acid, HCl, closer to seven, which neutralizes it. When using the buret the amount of NaOH used is able to be determined. Then by writing a balanced chemical equation and using the titration formula, Nb+Ma+Va=Na+MbVb , the molarity is able to be determined.
10. Repeat the procedure for a second metal. Analysis: Our data | Trial #1 | Trial | Mass of zinc | 1.99g | 4.01g | Mass of water in Calorimeter | 45g | 45g | Temp. of water in Calorimeter | 20°C | 21°C | Temp. of boiling water | 100°C | 100°C | Peak temp.
Part I: Density of Unknown Liquid | | Trial 1 | Trial 2 | Trial 3 | Mass of Empty 10 mL graduated cylinder (grams) | 26.10 | 26.15 | 26.05 | Volume of liquid (milliliters) | 8.69 | 8.50 | 8.31 | Mass of graduated cylinder and liquid (grams) | 37.00 | 36.70 | 36.10 | Part II: Density of Irregular-Shaped Solid | Mass of solid (grams) | 38.954 | 39.068 | 42.885 | Volume of water (milliliters) | 49.9 | 49.9 | 50.0 | Volume of water and solid (milliliters) | 54.1 | 54.1 | 55.0 | Part III: Density of Regular-Shaped Solid | Mass of solid (grams) | 27.50 | 26.70 | 27.40 | Length of solid (centimeters) | 5.25 | 5.00 | 4.50 | Width of solid (centimeters) | 3.00 | 4.00 | 3.50 | Height of solid (centimeters) | 2.50 | 3.00 | 2.00 | Calculations Show all of your work for each of the following calculations and be careful to follow significant figure rules in each calculation. Part I: Density of Unknown Liquid 1. Calculate the mass of the liquid for each trial. (Subtract the mass of the empty graduated cylinder from the mass of the graduated cylinder with liquid.) * Trial 1 37.00(g) – 26.10(g) = 10.90(g) * Trial 2 36.70(g) – 26.15(g) = 10.55(g) * Trial 3 36.10(g) – 26.05(g) = 10.05(g) 2.
Scraps of aluminum can weighing between 0.9 to 1.2 grams was then placed inside of the beaker and the beaker with the pieces of can was weighed again in order to obtain the mass of the aluminum can pieces. The beaker then had 50 mL of a 1.4 M KOH solution added and placed on a hot plate under a ventilation hood. In order to not let the solution boiled out of the top of the beaker, distilled water was added whenever it appeared to be reaching the top. As the paint was being removed from the can, an aspirator was set up. When it appeared as though the reaction was complete, which was when you could no longer see any pieces of metal that was still intact and hard, the faucet was turned on and a piece of filter paper was wet before been placed on the filter.
A divide by 100 B divide by 1000 C multiply by 100 D multiply by 1000 15 Which of the following is the smallest? A 0.07 7 C ----10 1 B -7 D 73% 7 A ----12 7 C ----16 7 B -9 7 D -8 5 Which one of these decimals could be rounded to 34.71? A 34.715 B 34.7 C 34.707 D 34.7039 1 6 What is -- as a percentage? 6 A 16% B 1.6% -C 16 2 % 3 D 60% 7 What is 37.5% of one day? A 10 hours B 8.6 hours C 9.6 hours D 9 hours 8 Increase $38 by 15%.
| 5.00V | 0.49A | 9. | 7.00V | 0.69A | 10. | 2.98V | 0.29A | | V drop | I through | 1. | 1.95V | 0.04A | 2. | 2.91V | 0.06A | 3.