Analytical Chemistry
Questions & Answers
Need help with this homework which is 6 summaries of 6 analytic chemistry journal readings from the American Chemical Society (ACS). For each summaries, only a paragraph is needed, like 250 words each. It has to be Analytical Chemistry journals. Here are the link: https://pubs.acs.org/action/showMostReadArticles? topArticlesType=recent&journalCode=ancham Choose any 6 articles from the above link and work on this assignment
1. Which of the following is the formula for calculating the molarity of a solution? a. #moles of solute x 100 b. # moles of solute/Liter of solution c. 10 gram molecular weight/Liter of solution d. 1 gram molecular weight/grams of solute 2. What is the molarity of a solution that contains 37.4 g of KCI (MW = 74.5) in 500 mL of water? a. 1.00 M b. 0.10 M c. 0.50 M d. 5.00 M 3. 80 g NaOH (MW = 40) is equal to how many moles of NaOH? a. 1 b. 2 C. 3 d. 4 4. True or False: Molarity and normality are measures of concentration. 5. How do you calculate the gram molecular weight of a molecule? a. Add all atomic weights in the molecule b. Multiply all atomic weights in the molecule c. Add all atomic weights in the molecule and multiply by 100 d. Multiply all atomic weights in the molecule and divide by 100 6. Which of the following is the formula for calculating the normality of a solution? a. N = mol/L b. N=mEq/mol c. N=nxM d. C₁V₁= C₂V₂ 7. What is the normality of a solution that contains 560 g NaOH (MW = 40) in 2 L of solution? a. 4 N b. 5 N c. 6 N d. 7 N 8. What is the normality of a solution containing H₂SO4 that has a molarity of 2.4 mol/L? a. 2.4 N b. 4.8 N c. 1.2 N d. 7.2 N 9. How many L of 1.025 N NaOH are needed to make 1 L of 1.0 N NaOH? a. 0.976 L b. 0.910 L c. 0.955 L d. 0.500 L 10. You need to make 100 mL of a 0.05 N solution of NaOH. The stock NaOH solution is 0.25 N. How many mL of stock solution will you need? a. 10 mL b. 15 mL C. 17.5 mL d. 20 mL
1. In a multiple dilution series, 20 μL of serum from tube 1 and 80 μL of diluent are added and mixed in tube 2. From tube 2, 10 µL is taken and added into 40 μL of diluent in tube 3. What is the dilution factor in tube 3?
2. A multiple dilution series was made. The sample was diluted 1:4, 1:2, 1:5, and 1:10. What is the final dilution in the last tube?
3. A multiple dilution series was made. The sample was diluted 1:2, 1:3, 1:4, and 1:5. The original concentration of the sample was 2400 mg/dL. What is the concentration of the sample in the last tube?
6. A series of 5 two-fold dilutions of concentrated solution is to be done. If 4 mL of diluent is put into each tube, how much concentrated solution will be added to tube 2? (Assume tube 1 is straight/1:1).
11. In a multiple dilution series, 10 mL of serum from tube 1 and 90 mL of diluent are added and mixed in tube 2. From tube 2, 10 mL is taken and added to 40 mL of diluent in tube 3. If the original concentration of the sample had been 50 mg/dL, what is the concentration in tube 3?
8. A stock glucose standard has a concentration of 100 mg/dL. A 1:50 dilution of the standard is done. What is the concentration of the resulting dilution?
10. A white blood count is done on a blood sample that has been diluted 1:20. The number of cells counted in the sample is 202 cells/μL. What should be reported for the undiluted sample?
