0.00512 * 500 = 2.56 c. 0.00806 * 319.9= 2.56 d. 0.00806 * 319.9 = 2.56 500 mL =0.5 L e. 0.0161 * 500 / 2 =2.56 4. Exercise 4: a. 0.250M; 250 mL 0.25 L (0.25) (0.25) = 0.0625 moles ZnI2 b. Prepare the solution by dissolving 19.95 grams of Zinc Iodide with 250 mL of water. c. Prepare the solution by dissolving 38.90 grams of ZnI2 with 500 mL of water.
In the first part, five 100 mL flasks of 5 mL ligand solution, 5 mL 2 M sodium acetate, 4 mL 3 M NH2OH, and 1-5 mL Fe2+ solution are diluted with water. The absorption spectrum for varying concentrations of Fe2+ are measured using a spectrophotometer and the data is graphed in Excel. The slope of the line is ε in the Beer-Lambart equation A = εcl. In the second part of the experiment, eleven flasks containing diluted stock solutions of Fe2+ and ligand are mixed with 5 mL 2 M sodium acetate and 4 mL 3 M NH2OH and diluted with water. The absorption spectrum is measured using a spectrophotometer and the data is graphed in Excel.
Once a light blue solution remained, 5mL of distilled water was added. This solution was then placed onto the magnetic stir plate and magnetic stir bar was placed in liquid solution. Then to the solution .75g of zinc was added to solution. Then once the solution was colorless, the solution was removed from magnetic stir plate and the liquid was decanted away from the copper. Then 5mL of HCl was added to copper to completely remove all traces of zinc.
Calculate the volume of 0.250 M H2SO4 that contains 0.250 g H2SO4. 0.250 g H2SO4 x 1 mole x 1 L = 0.0102 L 98.12 g 0.250 mole 5. 1.50 g of NaCl is dissolved in 100.0 mL of water. Calculate the concentration. 6.
- 0.5 M: Add 6.25 mL of the 2M HCl and mix with distilled water until the entire solution is measured to be about 25 mL Length and Mass of Magnesium Ribbon: • Original length: 30 cm • Original mass: 0.35 g • Length of ribbon used for experiment: 1.5 cm • Mass of ribbon used for experiment: 0.0175 g Concentration and Time data: 2.0 M 1.5 M 1.0 M 0.75 M 0.5 M Time (s) #1 13 s 18 s 38 s 81 s 225 s Time (s) #2 11 s 17 s 39 s 87 s 418 s Concentration and Temperature data: 2.0 M 1.5 M 1.0 M 0.75 M 0.5 M Temperature (Celsius) #1 30.1 30.1 30.2 30.5 28.5 Temperature (Celsius) #2 30.8 30.4 30.5 30.3 29.1 Results Table: Rate of Reaction for each concentration: 2.0 M 1.5 M 1.0 M 0.75 M 0.5 M Rate of Reaction 0.00145 0.001 0.000454 0.000208 0.0000755 Plot of Concentration vs Rate of
Fill 1000 mL Beaker half way with distilled water, and then record the initial temperature of water. 2. Pick out a goldfish, and put it in the beaker. (Let it have a couple of minutes to settle into the new surrounding). 3.
Solution Stoichiometry and Gas Law Problems Problem 1 In flask A, 1.500g of silver nitrate solid is dissolved in 50.0mL of water, while in flask B, 0.500g of potassium carbonate is dissolved in 25.0mL of water. The two solutions are then mixed together. a) Before mixing, what is the molarity of each solution? b) Write the balanced molecular equation, the complete ionic equation, and the net ionic equation for the reaction. c) If the percentage yield is 85.0%, what mass of precipitate is actually produced?
25 cm3 of a solution of sodium hydroxide reacts with 15 cm3 of 0.1 mol/dm3 HCl. What is the molar concentration of the sodium hydroxide solution? 4. Succinic acid has the formula (CH2)n(COOH)2 and reacts with dilute sodium hydroxide as follows: (CH2)n(COOH)2 + 2NaOH → (CH2)n(COONa)2 + 2H2O 2.0 g of succinic acid were dissolved in water and the solution made up to 250 cm3. This solution was placed in a burette and 18.4 cm3 was required to neutralise 25 cm3 of 0.1 moldm-3 NaOH.
About 50 mg of the powdered mycelium was transferred into a microtube contained 500 µl of TES (100 mMTris, pH 8.0, 10 mM EDTA, 2% SDS). To which, 50 µg proteinase K was added and incubated for 1 h at 60°C with occasional gentle mixing. To the above mixture, 140 µl of 5 M NaCl was added to adjust the salt concentration to 1.4 M. Then 65 µl of 10% CTAB (CetylTrimethyl ammonium bromide) was added and incubated for 10 min at 65°C. To the above mixture, 700 µl of Chloroform and isoamyl alcohol (24:1) was added, mixed gently, incubated for 30 min at 0°C and centrifuged at 10000 rpm for 10 min at 4°C. The supernatant was transferred to a 1.5 ml tube; to which 225 µl of 5 M NH4Ac was added, mixed gently, incubated on ice for 30 min and centrifuged at 10,000 rpm for 15 min at 4°C.
Mix. k. Measure out 3/4 cup of the solution from cup 3 and add it to cup 4. Mix. l. What are the relative salt concentrations of cups 1–4? Example: Cup 2 is made up of half stock solution and half tap water, which is a 50 percent relative salt concentration.