Part A: A solution of 100 ml of 500 ppm quinine solution was prepared this more...
Part A:
A solution of 100 ml of 500 ppm quinine solution was prepared this more concentrated solution was used to prepare a desired 5ppm quinine solution. How much solid quinine dihydrate (MW= 782.92 g/mol) will be needed to prepare the 500 ppm quinine solution, as well as the volume of 500 ppm quinine solution needed to make the 5ppm solution.
Part B:
If 61.1mg of quinine sulfate dehydrate was used what is the actual concentration in the solution ?
Homework Answers
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Part A:
A solution of 100 ml of 500 ppm quinine solution was prepared
this more...
You wish to prepare 100.0 mL of a 325.0 ppm w/v sodium (MW = 22.9897 g/mol)...
You wish to prepare 100.0 mL of a 325.0 ppm w/v sodium (MW = 22.9897 g/mol) solution. How many grams of sodium dichromate dihydrate (Na2Cr2O7·2H2O, MW = 297.998 g/mol) are needed to prepare this solution? Assume the final solution has a density of 1.00 g/mL.
A 4.112-g tablet, containing quinine was dissolved in 0.10 M HCl to give 500 mL. Dilution of a 10.0-mL aliquot to 100 mL...
A 4.112-g tablet, containing quinine was dissolved in 0.10 M HCl to give 500 mL. Dilution of a 10.0-mL aliquot to 100 mL yielded a reading for fluorescence intensity (at 347.5 nm) of 320 on an arbitrary scale. A second 10.0-mL aliquot was mixed with 10.0 mL of 100-ppm quinine solution before dilution to 100 mL. The fluorescence intensity of this solution was 433. Calculate the percentage of quinine in the tablet.
PROCEDURE 1. Prepare three 100 mL beakers for this experiment. Use the molecular weights on the bottles to calculate the amount of solid to use. a. *b. Prepare 25 mL of a 10 M NaOH solution (concentr...
PROCEDURE 1. Prepare three 100 mL beakers for this experiment. Use the molecular weights on the bottles to calculate the amount of solid to use. a. *b. Prepare 25 mL of a 10 M NaOH solution (concentrated NaOH solution). Calculate the amount of solid NaOH needed to make. *c. Prepare 50 mL of a 20 mM histidine solution (calculate the amount of solid histidine needed to make it, m.w. 209.6 g/mol). In the fume hood, add 3 drops of concentrated...
You wish to prepare 250.0250.0 mL of a 225.0225.0 ppm w/v Fe2+Fe2+ (MW=55.845 g/molMW=55.845 g/mol) solution....
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This requires the preparation of a 100 ppm Fe standard in a 500 mL standard flask....
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30. If we wish to prepare 250 mL of 0.200 M BaCl, solution, how much solid...
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a solution is prepared by dissolving 8.25 g ammonium sulfate to make 100.0 ml of solution....
a solution is prepared by dissolving 8.25 g ammonium sulfate to make 100.0 ml of solution. A 10.0 ml sample of this solution is then diluted to double its volume. Find the concentration of the final solution.
66. A student needs 500 ml of SOM HC solution. How much in ml, of concentrated...
66. A student needs 500 ml of SOM HC solution. How much in ml, of concentrated HCl is required to prepare this solution Concentrated 12.OM 67. A student weighs out 1.221 KHP and titrates to the equivalence point with 80. OmL of a standard NaOH solution. What is the concentration of the NaOH used to titrate the KHP? The molar mass of KHP is 204.22/mol 68. Hydrochloric Acid (HCI) is titrated with Sodium Hydroxide. Write and balance the chemical equation....
You are asked to prepare 500 mL 0.300 M acetate buffer at pH 4.90 using only...
You are asked to prepare 500 mL 0.300 M acetate buffer at pH 4.90 using only pure acetic acid (MW = 60.05 g/mol pk, = 4.76), 3.00 M NaOH, and water. How many grams of acetic acid will be needed to prepare the 500 mL buffer? Note that the given concentration of acetate refers to the concentration of all acetate species in solution. mass: What volume of 3.00 M NaOH, must be added to the acetic acid to achieve a...
You are directed to prepare 100 mL of a 500 mEq/L KOH standard. The primary standard...
You are directed to prepare 100 mL of a 500 mEq/L KOH standard. The primary standard used has a concentration of 0.400 Eq/L. When titrating your KOH solution, you discover that 4.0 mL of the primary standard reacted exactly with 5.0 mL of the KOH solution. a. What is the actual Eq/L concentration of the KOH solution? b. How many mEq are required to adjust the volume and concentration of the remaining 85 mL of KOH solution to 100 mL...
PROCEDURE 1. Prepare three 100 mL beakers for this experiment. Use the molecular weights on the bottles to calculate the amount of solid to use. a. *b. Prepare 25 mL of a 10 M NaOH solution (concentrated NaOH solution). Calculate the amount of solid NaOH needed to make. *c. Prepare 50 mL of a 20 mM histidine solution (calculate the amount of solid histidine needed to make it, m.w. 209.6 g/mol). In the fume hood, add 3 drops of concentrated...
30. If we wish to prepare 250 mL of 0.200 M BaCl, solution, how much solid BaCl, is needed? a. 4.17 g b.5.21 g c. 10.4 g d. 20.8 g 31. A solution is prepared by dissolving 3.50 grams of NHCl in enough water to make 250 mL of solution. What is the concentration of this solution? a. 0.0327 M b. 0.0654 M c. 0.131 M d. 0.262 M 32. What is the mass of NaCl in a 0.500 L...
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You are asked to prepare 500 mL 0.300 M acetate buffer at pH 4.90 using only pure acetic acid (MW = 60.05 g/mol pk, = 4.76), 3.00 M NaOH, and water. How many grams of acetic acid will be needed to prepare the 500 mL buffer? Note that the given concentration of acetate refers to the concentration of all acetate species in solution. mass: What volume of 3.00 M NaOH, must be added to the acetic acid to achieve a...
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