Water Body Y DO sample (0) DO blank (0) DO sample (5) DO Blank (5) Titration volume (ml) 3.Calculate the concentration of BOD in a body of water Y! 0,5 0,6 0,3 0,55
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- If pond water has a pH of 5, the hydroxide concentration would be: a. 10-5M. b. 10-10M. c. 105M. d. 109M. e. 10-9M.pls compute how to prepare the solutions1. 100.0 mL 0.0500 M stock Ca2+ solutiona. Weigh appropriate amount of pure CaCO3 (FW=100.09) to the nearest 0.1 mg into a 250 mL beaker. Add about 40.0 mL distilled water. Take note of the purity of CaCO3 used.b. Carefully and slowly add concentrated HCl to dissolve the CaCO3 solids while stirring and heating the solution in a hotplate. Do this until the CaCO3 solids are completely dissolved or until no more effervescence is observed.2. 100.0 mL 0.0500 M stock Ca2+ solutiona. Weigh appropriate amount of pure CaCO3 (FW=100.09) to the nearest 0.1 mg into a 250 mL beaker. Add about 40.0 mL distilled water. Take note of the purity of CaCO3 used.b. Carefully and slowly add concentrated HCl to dissolve the CaCO3 solids while stirring and heating the solution in a hotplate. Do this until the CaCO3 solids are completely dissolved or until no more effervescence is observed.NOTE: The stirring must be vigorous enough to dissolve the solids. It is advisable…1. Tools that do not need to be brought when sampling is…a. thermometerb. Hygrometerc. PH meterd. DO meter 2. In the deposition method, one of the conditions that must be met is…a. The precipitate has a high solubility or solubility productb. The precipitate formed must be quite difficult to dissolvec. The precipitate formed does not have to be quite pured. Free precipitate form
- 1.what does a slope if titration curve indicate? write down the functions of mixed indicators. 2. Iodometric titration can not perform above PH 9 - Explain.6. For every one unit change in pH, how many is the equivalent change in H+ concentration? A. 10x B. 100,000x C. 100x D. 10,000xIs there a difference between pH measurements using the pH meter and the pH paper? Compare the initial pH and the final pH of each sample. What was the most effective buffer? What was the least effective? Solución pH inicial pH final Diferencia water 7.45 2.48 0.1 M NaCl 7.28 2.03 milk 6.78 6.45 buffer de fosfato 8.76 7.78 **** Calculate the difference (subtract) the initial pH - final pH values to identify the effectiveness of each solution as a buffer. Values with little difference mean that a less drastic change occurred and are therefore more effective. On the contrary, values by much difference reflect drastic changes in pH and are less effective. What do buffers do and why are they important in biological systems?
- fill in the volumes required to make the various dilutions of Coomassie Blue and their respective concentrations. show sample calculations.Concentration Buffer solution pka Desired ph 1 0.50 M Phosphate 2.12 2.0 2 0.50 M Phosphate 2.12 3.0 3 0.50 M Acetate 4.70 5.0 4 0.50 M Phosphate 7.21 7.0 5 0.050 M Phosphate 7.21 7.50 6 0.010 M Phosphate 7.21 8.0 7 0.50 M Phosphate 12.32 12.046 50 52 60 41 46 55 Find the ff. WITH SOLUTION PLEASE MeanMedianModeSDVarianceCVQuartile 2Decile 7Percentile 25Percentile 30
- A buffer system .... a) All options are correct b) Counteracts pH changes in a solution c) Does the blood protein work as d) Releases protons (H +) if pH increasesAt a pH of 7.40, the carbonic acid ratio is ________.a. 35:1b. 4:1c. 20:1d. 3:14. Your pharmacy has on hand Dakins Irrigation Solution 1 liter.You receive a prescription for Dakins Irrigation Solution Irrigate chest tube with 100 mL bid for 14 days. How many full liters would you prepare and dispense? (Use only whole numbers) 5. Your pharmacy has on hand Augmentin 125 mg/5 mL suspension.You receive a prescription for Augmentin 125 mg/5 mL suspension. Give 1 ½ tsp q8h x 5 days. How many milliliters of suspension would you dispense for a 5 day supply? Convert the total mL to dispense from the question above into ounces. How many ounces would you dispense? 6. Your pharmacy has on hand Robitussin CF Syrup (guaifenesin 100 mg/1 tsp).You receive a prescription for Robitussin CF Syrup and the patient is to receive 250 mg of guaifenesin q4h. How many milliliters will the patient receive in 1 dose? If you dispense a 4oz bottle of syrup, how many doses will the patient receive?