1) Make up the following standard samples NOTE: when measuring the volumes to make the bellow samples, use only one pipette/volume rounding it to the closet setting to the required volume (do not measure 247.5 µl as 240 µL and 7.5 µL, rather measure it as 248 µL) a. 247.5 pl of dH2O + 22.50 µL Stock BSA (5 µg/µL) + 30.0 µL 0.25 M Tris (pH 7.5) b. 258.75 µl of DH2O + 11.25 µL Stock BSA (5 µg/µL) + 30.0 µL 0.25 M Tris (pH 7.5) c. 262.5 µL of dH2O + 7.5 µL Stock BSA (5 µg/µL) + 30.0 µL 0.25 M Tris (pH 7.5) d. 232.5 µL of dH2O + 37.5 µL 1/10 BSA (0.5 µg/µL) + 30.0 µL 0.25 M Tris (pH 7.5) e. 251.25 µl of dH2O + 18.75 µl 1/10 BSA (0.5 µg/µL) + 30.0 µL 0.25 M Tris (pH 7.5) please help me determine (show calculation) the BSA loaded in microgram

A forensic chemist prepares a standard of caffeine in chloroform for use in a quantitative assay. The caffeine is purchased from a reputable supply company and arrives with a certificate stating that it is 99.5% pure or better (written 99.5% + or + 99.5%). The analyst needs to make a stock solution at a concentration near 1 mg/mL. To do so, she obtains a Class A 50.00 mL volumetric flask (± 0.05 mL) and uses an analytical balance to accurately weight out 49.6 mg. The balance uncertainty is listed as ± 0.0003 g near the 50 mg range. The analyst quantitatively transfers the powder to the flask and carefully dilutes the solution to volume. Report the concentration of the solution in mg/mL and the propagated uncertainty associated with it. Use the NUSAP form to report your answer with the proper number of significant figures in the final result. You get to pick which “assessment” is presented.

O STOICHIOMETRY OO Jada Dilution A chemist makes 510. mL of zinc oxalate (ZnC,0, working solution by adding distilled water to 300, mL of a 139. µM stock solution of zinc oxalate in water. Calculate the concentration of the chemist's working solution. Round your answer to 3 significant digits. Explhation Check 2021 McGraw H Education All Rights Reserved Terms of Use Privacy Accessibil esc Thank The & 1 2 4 6 8 9 tab W E R T Y { } P A os lock G H K V B N M < "ontrol option command command option

I need help in 5 a and 5 b please

ATES OF MATTER Solving applied mass concentration problems GenAlex Medical, a leading manufacturer of medical laboratory equipment, is designing a new automated system that can detect normal levels of dissolved triiodothyronine (230. to 660. pg/dL), using a blood sample that is as small as 150 µL. Calculate the minimum mass in picograms of triiodothyronine that the new system must be able to detect. Be sure your answer has the correct number of significant digits. Pg X 3/5 S

Find the percent by mass of sodium chloride in a 1.20 M NaCl solution. The density of the solution is 1.07 g/mL. [ΨΕΙ ΑΣΦ esc Submit Provide Feedback ! 1 Request Answer F1 A @ 2 F2 W S ? #3 80 F3 % E S4 $ D a F4 R % 5 F 2 F5 MacBook Air T 6 F6 G & < 7 Y

(0.0029 m + 25.68 m) / 3.59 s

The following volumes of 0.000300 M SCN are diluted to 15.00 mL. Determine the concentration of SCN in each sample after dilution. These values will be used during the experiment. To enter exponential values, use the format 1.0e-5. Sample 0.000300 M SCN (mL) [SCN'] (M) 1 1.50 3.50 7.00 4 10.00 3.

Part B (Trial #1) Part C (Trial #2)   Mass of empty evaporation dish     154.48 g   158.34 g Volume of sodium chloride solution added to evaporation dish   10.0 mL   10.0 mL Mass of evaporation dish containing sodium chloride crystals after evaporating the water and drying     154.94 g     159.85 g   Determine the average mass/volume % of salt in water.

Explain the results obtained in this experiment