You have 100 mL of solvent available to do an extraction. Which will give a better separation? a. 1 extraction with 100 mL b. 2 extractions with 50 mL c. 5 extractions with 20 mL d. 3 extractions with 25 mL

An unknown was found to contain 10.80 ug of analyte per liter. A spike of 4.30 ug/L was added to a replicate portion of unknown. Analysis of the spiked sample gave a concentration of 15.10 pg/L. Find the percent recovery of the spike. % recovery = If the acceptable recovery is specified to be in the range from 96 to 104%, is the recovery of the spike acceptable? yes no hulu 山T四回

please solve question 16

Think about the situation where you are investigating the relationship of study time vs. exam grade.a. Which variable would be on the x-axis (and why)?b. Which variable would be on the y-axis (and why)?c. Would you expect the slope to be positive or negative (and Why)? 2) Contrast and compare interpolation with extrapolation. Which is “safer” to use and why?3) Look up how “the best fit straight line” is constructed. The term “Least squares” should be in your explanation.4) If I plot some data and end up with a r2 of (-) 0.99, is my plot useless? Explain.

If a 20-mL solvent extracts 80% of the analyte in a single extraction, the "total" extraction efficiency after three successive 20-mLs of extraction would be summed to

2. Look up the solubility data for benzoic acid in the solvent toluene. Is benzoic acid more or less soluble in toluene than water? Why? 3. What would be a disadvantage of using toluene in this experiment? J 2. Look up the solubility data for benzoic acid in the solvent toluene. Is benzoic acid more or less soluble in toluene than water? Why? 3. What would be a disadvantage of using toluene in this experiment?

I need help with the remaing values in the first picture please!!

Make 200 ml of a 15 mM Tris, 50 mM EDTA, and 0.03 M NaCl from stock solutions that are1M Tris, 0.5 M EDTA, and 5000 mM NaCl.

You are tasked with performing a recrystallization. You have 3 potential solvents to use, but you don't know which one will work. How will you go about deciding which solvent to use?

How can you remove insoluble impurities during a recrystallization? options: 1-Hot gravity filtration. 2- Vacuum filtration 3- It is not possible.You should choose another separation method. 4- Pick out the impurities with tweezers.