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Please answer pre lab question 4. Thank you!
3. Dilute the 0.1 g/L quinine standard solution...
3. (20) You are required to prepare standards for a calibration curve. All the glassware and...
3. (20) You are required to prepare standards for a calibration curve. All the glassware and pipettes your method requires have a tolerance (RSD) of 0.1%. You start with a working solution of 0.1 M analyte. Remove 10 mL of that solution with a pipette, add it to a 100 mL volumetric flask and dilute it to the mark. Remove 10 mL of the newly prepared (diluted) standard, add to a 50 mL volumetric flask, and dilute it to the...
II. Digestion of Acetylsalicylic acid(standard and tablet) with NaOH . Digestion of Acetylsalicylic Acid Standard to Pr...
II. Digestion of Acetylsalicylic acid(standard and tablet) with NaOH . Digestion of Acetylsalicylic Acid Standard to Prepare Stock Solution: Obtain ca. 0.1 g dried acetylsalicylic acid (MM = 180.16 g/mol), accurately weighed, and quantitatively transfer to a 125-ml Erlenmeyer flask. Add 5 ml 1.0 M NaOH and heat mixture to boiling on a hot plate. This will hydrolyze the acetylsalicylic acid to sodium salicylate. If necessary, rinse down the walls of the Erlenmeyer with DI water to ensure complete hydrolysis...
0.276 g KH2PO4 (record the mass you use to the nearest 0.1 mg) and transfer quantitatively...
0.276 g KH2PO4 (record the mass you use to the nearest 0.1 mg) and transfer quantitatively into a 250 mL volumetric flask. Bring to volume. Use a volumetric pipet to transfer 1.0 mL of this solution into a 100 mL volumetric flask and bring to volume. Calculate the molarity of this more dilute stock solution.
The recommended procedure for preparing a very dilute solution is not to weigh out a very...
The recommended procedure for preparing a very dilute solution is not to weigh out a very small mass or measure a very small volume of stock solution. Instead, it is done by a series of dilutions. A sample of 0.8521 g of KMnO4 was dissolved in water and made up to the volume in a 500.0−mL volumetric flask. A 2.000−mL sample of this solution was transferred to a 1000−mL volumetric flask and diluted to the mark with water. Next, 10.00...
#1, #3, and #5-7 please!!! Pre-Lab Questions 1. Write the balanced chemical equation for the formation...
#1, #3, and #5-7 please!!!
Pre-Lab Questions 1. Write the balanced chemical equation for the formation of FeSCN2" from Fe(NO3)3-9H:0 and NaSCN. 2. In this experiment a dilute solution of 0.1 M HNO is used to maintain the ionic strength and low pH needed for the reaction to occur. How is nitric acid classified in terms of MSDS? What are some of the safety concerns regarding the handling of nitric acid? 3. Look at the procedure for making the standard...
The concentration of NaH2PO4 in a solution is 3.23 x 10-4 mol/L.
The concentration of NaH2PO4 in a solution is 3.23 x 10-4 mol/L. (a) Find the molarity (in mol/L) of Pin the solution. (b) What is the concentration of P in ppm or mg/L (molar mass of P = 30.97). (c) If 5.00 mL of the above solution was transferred into a 1.00-Liter volumetric flask and then dilute to the mark with DI water, what is the concentration of P in ppm after dilution?
Exp 8 Pre-Lab Questions Name: Section: 140 6. A chemist takes a 100 mg/L vitamin C...
Exp 8 Pre-Lab Questions Name: Section: 140 6. A chemist takes a 100 mg/L vitamin C sample and exposes it to the open air for two weeks. The concentration of vitamin C in the exposed sample was reduced to 75 mg/L. Calculate the % decrease in vitamin C concentration in the original sample. Show your calculation 75/100 = 1 meaning that there was a 25% decrease In organd sample concetton When doing dilutions whilst working in concentration of mg/L, remember...
need help on these Suppose you obtained the following data from two standard solutions of known...
need help on these
Suppose you obtained the following data from two standard solutions of known concentrations using a UV-Vis spectroscope: Analysis # Conc. (mg/L) 8.00 20.00 Absorbance (at 255 nm) 0.160 0.390 What is the concentration (in mg/L) of an unknown solution with an absorbance of 0.200 at 255 nm 10 points)? The unknown solution contains the same analyte as the standard solution does (Assume a path length of 1cm). 10. You prepared a stock solution by dissolving a...
Can you answer question 4 & 5? The experiment and porcedure is posted below Question 4...
Can
you answer question 4 & 5? The experiment and porcedure is
posted below
Question 4 & 5
CHM3120C Analytical Chemistry Lab Lab 7. Spectrophotometric Determination of Iron in Mohr's Salt with o-Phenanthroline Required Reagents and Supplies: 50 mL of 0.0005M -0.0006 M of Mohr's solution (unknown), 10 g of Hydroxylamine hydrochloride (NH2OH, HCI), 500 mL of o-phenanthroline solution (contains 0.5 g of o-phenanthroline monohydrate), 83 g of sodium acetate (NaOAc. 3H20) in 500 mL of water (for 1.2 M...
Calculate the initial concentration of iron(III) in solution #1, #2, #3. Beaker (mL) Table 1. Reagent...
Calculate the initial concentration of iron(III) in
solution #1, #2, #3.
Beaker (mL) Table 1. Reagent Solutions Provided by the Stockroom Solution Name Reagent [Reagent] (M) Volume (mL) Standard iron Fe(NO3)3 2.50 x 10 in 0.10 M HNO3 nitric acid HNO3 0.10 120 35 50 250 conc. SCN KSCN 0.50 30 50 dilute SCN KSCN 2.50 x 10-3 30 50 Worksheet 1 #1 5.00 #2 10.00 #3 15.00 Dilute iron (mL) [Fe**] (M) [Fe(SCN)?*] (M) %T 480 58.9 35.8 21.5...
3. (20) You are required to prepare standards for a calibration curve. All the glassware and pipettes your method requires have a tolerance (RSD) of 0.1%. You start with a working solution of 0.1 M analyte. Remove 10 mL of that solution with a pipette, add it to a 100 mL volumetric flask and dilute it to the mark. Remove 10 mL of the newly prepared (diluted) standard, add to a 50 mL volumetric flask, and dilute it to the...
#1, #3, and #5-7 please!!!
Pre-Lab Questions 1. Write the balanced chemical equation for the formation of FeSCN2" from Fe(NO3)3-9H:0 and NaSCN. 2. In this experiment a dilute solution of 0.1 M HNO is used to maintain the ionic strength and low pH needed for the reaction to occur. How is nitric acid classified in terms of MSDS? What are some of the safety concerns regarding the handling of nitric acid? 3. Look at the procedure for making the standard...
Exp 8 Pre-Lab Questions Name: Section: 140 6. A chemist takes a 100 mg/L vitamin C sample and exposes it to the open air for two weeks. The concentration of vitamin C in the exposed sample was reduced to 75 mg/L. Calculate the % decrease in vitamin C concentration in the original sample. Show your calculation 75/100 = 1 meaning that there was a 25% decrease In organd sample concetton When doing dilutions whilst working in concentration of mg/L, remember...
need help on these
Suppose you obtained the following data from two standard solutions of known concentrations using a UV-Vis spectroscope: Analysis # Conc. (mg/L) 8.00 20.00 Absorbance (at 255 nm) 0.160 0.390 What is the concentration (in mg/L) of an unknown solution with an absorbance of 0.200 at 255 nm 10 points)? The unknown solution contains the same analyte as the standard solution does (Assume a path length of 1cm). 10. You prepared a stock solution by dissolving a...
Can
you answer question 4 & 5? The experiment and porcedure is
posted below
Question 4 & 5
CHM3120C Analytical Chemistry Lab Lab 7. Spectrophotometric Determination of Iron in Mohr's Salt with o-Phenanthroline Required Reagents and Supplies: 50 mL of 0.0005M -0.0006 M of Mohr's solution (unknown), 10 g of Hydroxylamine hydrochloride (NH2OH, HCI), 500 mL of o-phenanthroline solution (contains 0.5 g of o-phenanthroline monohydrate), 83 g of sodium acetate (NaOAc. 3H20) in 500 mL of water (for 1.2 M...
Calculate the initial concentration of iron(III) in
solution #1, #2, #3.
Beaker (mL) Table 1. Reagent Solutions Provided by the Stockroom Solution Name Reagent [Reagent] (M) Volume (mL) Standard iron Fe(NO3)3 2.50 x 10 in 0.10 M HNO3 nitric acid HNO3 0.10 120 35 50 250 conc. SCN KSCN 0.50 30 50 dilute SCN KSCN 2.50 x 10-3 30 50 Worksheet 1 #1 5.00 #2 10.00 #3 15.00 Dilute iron (mL) [Fe**] (M) [Fe(SCN)?*] (M) %T 480 58.9 35.8 21.5...
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