Following the grinding of 1.526 g of cereal, extraction of riboflavin is performed as described in the lab manual, using 40.0 mL of water and 0.25 mL of glacial acetic acid, followed by sonication and filtration. 275 uL of this extraction solution is diluted to 10 mL in pH 7.0 phosphate buffer. Fluorescence intensity measured 153.00 a.u. at the operational wavelength. If the external standard calibration curve equation (fluorescence intensity v. concentration in ppb) is y = 4.00 *x + 26.7, then what is concentration of the extraction solution in ppm? How many mg of riboflavin was extracted?

If you place one Excedrin tablet in a 250 milliliter volumetric flask what will be the concentration of each active ingredient? How would you prepare a solution that contained the active ingredients in the 20-50 microgram/mL range from the solution containing the tablet in 250 mL?

Notes: Excedrin active ingredients and dosage are Acetaminophen 250 mg, Aspirin 250 mg, and Caffeine 65 mg.

Indicate in which solvent the electrostatic force between oppositely charged ions would be the strongest, given the same separation distance, r, for the ions. The dielectric constants of the solvents are: water (80.4), methyl alcohol (32.6), ethyl alcohol (24.3), and acetone (6.5)

please explain how to get the answer!!

At 20^oC, a saturated solution of silver acetate, AgCH₃CO₂, contains 1.0 g of the compound dissolved in 100. mL of solution. Calculate K_sp for silver acetate (ignoring hydrolysis)

The most important commercial process for generating hydrogen gas is the water-gas shift reaction: CH4(g) + H2O(g) → CO(g) + 3H2(g)

a) Use tabulated thermodynamic data to find ΔG° for this reaction at the standard temperature of 25°C.

b) Now calculate ΔG°₁₁₀₀ for this process when it occurs at 1100 K.

Hello,
I was wondering what are other methods to perform a limonene extractions from orange peels and mint leaves rather than the steam and soxhlet extractions? thank you

1.) For the chemical reaction 2 Al + 3 H 2 SO 4 ⟶ 3 H 2 + Al 2 ( SO 4 ) 3 what mass of hydrogen is produced from 1.97 mol of aluminum?

2.) Convert 1.77×1024 atoms of carbon to moles of carbon.

1.77×1024 atoms=

3.) For the reaction

2KI+Pb(NO3)2⟶PbI2+2KNO3how many grams of lead(II) iodide, PbI₂, are produced from 89.7 g of potassium iodide, KI?

4.)For the reaction

2NaOH+H2SO4⟶Na2SO4+2H2O

how many grams of sulfuric acid, H₂SO₄, are needed to react completely with 33.1 g of sodium hydroxide, NaOH?

PLEASE HELP...I WOULD GREATLY APPRECIATE IT...

Explain in detail the experimental procedure you would use to find heat of solution when sodium chloride is dissolved into water. (Answer in detail.)

a) Definition of terms.Please briefly give the meaning of each of the following terms:

1. colligative property 2. vapor pressure 3. semi-permeable membrane 4. osmosis 5. dialysis

A compound, XF4, is 52.44% X by mass. What is the molecular geometry of XF4?

A) tetrahedral B) square planar C) square pyramidal D) see-saw E) none of the above

Please explain to me why the answer is square planar. What needs to be calculate in order to do this problem?

How to calculate unreacted concentration of A at 2hr when rate = k[A]¹[B]¹ (first order both A and B) and rate = k[A]⁰[B]⁰ (zero order both A and B) ?

A + B --> C, 1hr: A 75% reacted

The total of all carbonate species in lake water is 0.001 M, and the lake pH is 8.

Calculate the concentration of each of the individual carbonate species.

Explain in detail the experimental procedure you would use for determining the concentration of acetic acid in an aged wine sample. ( Answer in detail)

If the pH of a 2.54-cm rainfall over 3700 km2 is 3.20, how many kilograms of sulfuric acid, H2SO4, are present, assuming that it is the only acid contributing to the pH? For sulfuric acid, Ka1 is very large and Ka2 is 0.012.

Express your answer to two significant figures and include the appropriate units.