Question: What is the most effective buffer against bases? 6. Determination of buffer capacty Buffer solution Buffer capacity Acid added 0.035 0.085 0.167 Volume added 0.10M NagH Desired pH 0.10 M HCI Base added 1 2 3.0 4.0 1 1 1 1 0.063 0.039 3 4 6.0 8.0 0.05 0.387 0.0246 0.0886 1 3.87 9.50 9.0 0.492 0.0886 6 7 13.0 4.99 0.5
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- A mixture containing only KCl and NaBr is analyzed by the Mohr Method. A 0.3172-g sample is dissolved in 50 mL water and titrated to the Ag2CrO4 endpoint, requiring 36.85 mL of 0.1120 M AgNO3. A blank titration requires 0.71 mL of titrant to reach the same endpoint. Report the % (w/w) KCl and NaBr in the sample. [Ans . 84.41 % (w /w); 17.59 % (w /w)]The dilution factor for Sample 1 if 20 µL of extract is added to 980 µL distilled water is 50. What would the dilution factor for Sample 1 be if 500 µL of the diluted sample from last sentence were diluted with 500 µL distilled water?Prepare 100mL of a 2M MgO (magnesium oxide) solution. i) what is the molarity wanted? ii) what is the total volume of solution wanted (in LITERS)? iii) What is the molar mass of MgO? iv) What is the mass of MgO (solute) needed? v) What is the volume of water (solvent) needed?
- What is the chemistry principle behind when (treatment: heavy cream) is subjected to room temperature? Why does beating time, stability (%drain) and volume foam (specific gravity) is important? see the data below Treatment (Heavy Cream) Beating Time (min) Stability (%drain) Volume of Foam (Specific Gravity) (Room Temperature) 20 No drain 0.94 Heavy Cream (chilled) 20 No drain 0.76 Heavy Cream with sugar and vanilla 20 No drain 0.88 Heavy Cream (over-whipped) 25 No drain 0.83Calculate the pH of a buffer that contains 0.15 M MOPS anionic form and 0.25M MOPS zwitterion. The pKa is 7.2A prescription asked for a 500 mL 12% dextrose solution. How would you prepare the prescription if the available dextrose solutions in the pharmacy are 10% and 20%?
- I need the full answer... At 10 am you received a doctors order that you have to Infuse 1,000ml of PNSS in 10 hours to Mr Dela Cruz. What is the correct rate of this isotonic solution when the drop factor is 10 gtt = 1ml ? 15.73 qtts/min 31.249 qtts/min 49 qtts/min 18 qtts/minThe doctor ordered Oxacillin 650mg every 6 hours. The instructions on the 2gm vial states to reconstitute with powder with 11.5ml of sterile water for injection, yielding 220mg/1.5ml. How many ml will you administer? using dimensional analysis and show workTable of caffeine standards concentration Sample Conc, ppm Std1 16 Std2 32 Std3 48 Std4 64 Std5 80 If the volume used to make 100 mL of std 1 is 2 uL what is the concentration in M used to make a standard calibration curve? The standards are going to be used to build calibration curve to analyze caffeine in an energy drink. If 500 mL of the energy drink has target of 400 mg caffeine, how will you prepare the sample if you need 10 mL for the analysis ? . Caffeine MM=194.19 g/mol.
- My data is attached, please 1.) Create a scatter chart with all the data then **Using your graph - predict how many seconds it will take to dissolve an Alka-Seltzer® tablet in 200 mL of water at the following temperatures. Use the exponential trend line to find the function used in predicting the time. If needed, please refer to the Introduction to Graphing manual for guidance. 15°C, 35°C and 60°CWhat is the chemistry principle behind when (treatment: heavy cream) is subjected to CHILLED TEMPERATURE? What is the effect in beating time, stability (%drain) and volume foam (specific gravity) is important? see the data below Treatment (Heavy Cream) Beating Time (min) Stability (%drain) Volume of Foam (Specific Gravity) (Room Temperature) 20 No drain 0.94 Heavy Cream (chilled) 20 No drain 0.76 Heavy Cream with sugar and vanilla 20 No drain 0.88 Heavy Cream (over-whipped) 25 No drain 0.832 if there is a stock solution of 2000 (ug/ml) , is it possible to use SERIAL DILUTION to generate the following 8 tubes with their concentrations? A 2000 (ug/ml) B 1500 (ug/ml) C 1000 (ug/ml) D 750 (ug/ml) E 500 (ug/ml) F 250 (ug/ml) G 125 (ug/ml) H 0 (ug/ml)