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3) A solution contains 3.75 x 102 mg/mL of A (MW=220 g.mol1). This corresponds...
1) A solution containing 3.75 mg/100 ml of A (MW - 220 g/mol) has a transmittance...
1) A solution containing 3.75 mg/100 ml of A (MW - 220 g/mol) has a transmittance of 39.6% in a 1.50 cm cell at 480 nm. Calculate (a) the molar absorptivity of A, and (b) the transmittance of a solution of A which is twice as concentrated as the solution described above.
Your test your tap water and find that it contains 45 mg of lead in 1750...
Your test your tap water and find that it contains 45 mg of lead in 1750 mL of solution. Represent this concentration in a.) ppm (mg/L) b.) ppb (ug/L) Include 3 significant figures and units in your answers
You have a stock solution that contains 24 mg/ml of protein. You want to make a...
You have a stock solution that contains 24 mg/ml of protein. You want to make a set of standards with the following concentrations: 12 mg/ml, 6 mg/ml, 3 mg/ml and 1.5 mg/ml. You need a minimum of 500 ul of each standard after all dilutions are completed. Using the technique of serial dilution, explain how you would make your standards by filling in the chart below. Std 1 Std 2 Std 3 Std 4 concentration (mg/ml) 12 6 3...
A) A chemist prepares a solution by adding 304 mg of Co(NO3)2 (MW = 182.94 g/mol)...
A) A chemist prepares a solution by adding 304 mg of Co(NO3)2 (MW = 182.94 g/mol) to a volumetric flask, and then adding water until the total volume of the contents of the flask reaches the calibration line that indicates 100 mL. Determine the molarity of the prepared solution. B) Determine the mass of chloride (MW = 35.45 g/mol) in grams present in 100mL of a 0.289 M solution of aqueous FeCl3 (iron(III) chloride). C) A beaker contains 250 mL...
Part B: A chemist prepares a solution by adding 415 mg of CoCl2 (MW = 129.84...
Part B: A chemist prepares a solution by adding 415 mg of CoCl2 (MW = 129.84 g/mol ) to a volumetric flask, and then adding water until the total volume of the contents of the flask reaches the calibration line that indicates 100 mL. Determine the molarity of the prepared solution. (moles per litre, 3 sig figs) Part C: Determine the mass of chloride (MW = 35.45 g/mol ) in grams present in 100 mL of a 0.166 M solution...
1. Calculate M, m, mole fraction, mass %, ppb (mass/vol) for the following solution: 0.550 mg...
1. Calculate M, m, mole fraction, mass %, ppb (mass/vol) for the following solution: 0.550 mg Fe in 1.4 L pure water (d = 1.0 g/mL) @ 4°C. Assume no volume change from the addition of Fe. 2. If an experiment involving this solution is carried out by changing its temperature and recalculating iron concentration, which concentration units above would you prefer, and which would you avoid and why?
Lab 5: Additional Dilution Problems You have a stock solution that contains 24 mg/ml of protein....
Lab 5: Additional Dilution Problems You have a stock solution that contains 24 mg/ml of protein. You want to make a set of standards with the following concentrations: 12 mg/ml, 6 mg/ml, 3 mg/ml and 1.5 mg/ml You need a minimum of 500 ul of each standard after all dilutions are completed. Using the technique of serial dilution, explain how you would make your standards by filling in the chart below. Std 4 Std 1 12 Std 2 6 Std...
A solution contains 20 ppm Ca+2. Express the Ca+2 concentration in the following terms: 21. A...
A solution contains 20 ppm Ca+2. Express the Ca+2 concentration
in the following terms:
21. A solution contains 20 ppm Cat2. Express the Ca+2 concentration in the following terms: a. g Cat2 in 1,000,000 mL water (mL = 0.001 L) b. g Cat2 in 100 mL water c. % Cat2 in the 100 mL water d. mg Ca 2/kg water (mg = 0.001 g = 0.000001 kg) e. molarity (M or moles Cat2/L).
What is the concentration of an AlBrz solution if 150. mL of the solution contains 250....
What is the concentration of an AlBrz solution if 150. mL of the solution contains 250. mg of Brion? OA) 1.67 M OB) 6.23 * 10-3 M C) 2.08 x 10-2 M OD 6.95 x 10-3M
I MAINLY NEED HELP ON TABLES PLS HELP THANK YOU Materials: NaOH MW = 40 g/mL,...
I MAINLY NEED HELP ON TABLES
PLS HELP THANK YOU
Materials: NaOH MW = 40 g/mL, KHP - potassium hydrogen phthalate, KHC2H4O4, MW = 204.23 g/mol. Acetic acid, HC2H302, MW = 60.05 g/mol Part 1: Standardization of NaOH Assume 0.951 g of KHP is weighed and transferred to a 250 mL Erlenmeyer flask. Approximately 50 mL water is added to dissolve the KHP. Note that the exact volume of water is not important because you only need to know the...
1) A solution containing 3.75 mg/100 ml of A (MW - 220 g/mol) has a transmittance of 39.6% in a 1.50 cm cell at 480 nm. Calculate (a) the molar absorptivity of A, and (b) the transmittance of a solution of A which is twice as concentrated as the solution described above.
Lab 5: Additional Dilution Problems You have a stock solution that contains 24 mg/ml of protein. You want to make a set of standards with the following concentrations: 12 mg/ml, 6 mg/ml, 3 mg/ml and 1.5 mg/ml You need a minimum of 500 ul of each standard after all dilutions are completed. Using the technique of serial dilution, explain how you would make your standards by filling in the chart below. Std 4 Std 1 12 Std 2 6 Std...
A solution contains 20 ppm Ca+2. Express the Ca+2 concentration
in the following terms:
21. A solution contains 20 ppm Cat2. Express the Ca+2 concentration in the following terms: a. g Cat2 in 1,000,000 mL water (mL = 0.001 L) b. g Cat2 in 100 mL water c. % Cat2 in the 100 mL water d. mg Ca 2/kg water (mg = 0.001 g = 0.000001 kg) e. molarity (M or moles Cat2/L).
What is the concentration of an AlBrz solution if 150. mL of the solution contains 250. mg of Brion? OA) 1.67 M OB) 6.23 * 10-3 M C) 2.08 x 10-2 M OD 6.95 x 10-3M
I MAINLY NEED HELP ON TABLES
PLS HELP THANK YOU
Materials: NaOH MW = 40 g/mL, KHP - potassium hydrogen phthalate, KHC2H4O4, MW = 204.23 g/mol. Acetic acid, HC2H302, MW = 60.05 g/mol Part 1: Standardization of NaOH Assume 0.951 g of KHP is weighed and transferred to a 250 mL Erlenmeyer flask. Approximately 50 mL water is added to dissolve the KHP. Note that the exact volume of water is not important because you only need to know the...
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