The average molecular weight of the triglycerides in coconut oil is 680 g/mol. How much NaOH (in grams) is required to completely saponify this oil? Why is it important to use less than this amount when preparing soap?

Pyridine is used in the synthesis of tosyl chloride from tosic acid, and also in reactions that involve tosylate esters. What characteristic of pyridine makes it the base of choice for these reactions? What might happen if a base were used that did not have this particular characteristic?

How does soap remove an oil spot?

The very useful restriction enzyme SpoBob hydrolyses the phosphodiester bond between the guanylates in the sequence AGGACCA. Is SpoBob generating blunt or sticky ends? Please explain.

this is actually biochemistry

The concentration of NO3– in a water sample is determined by a onepoint standard addition using a NO3– ion-selective electrode. A 25.00-mL sample is placed in a beaker and a potential of 0.102 V is measured. A 1.00-mL aliquot of a 200.0-mg/L standard solution of NO3– is added, after which the potential is 0.089 V. Report the mg NO3–/L in thewater sample.

Briefly describe how you would determine whether a given salt will produce an acidic, basic, or

neutral solution when dissolved in water.

Synthesis of potassium trioxalatoferrate (volumetric techniques and KMnO4 titration)

Work the following problems:

a. suppose you have as much 0.03200 M KMnO4 as you need. State exactly what data must be recorded in order to analyze a solid of potassium trioxalatoferrate for both iron and oxalate.

b. Describe the titration endpoint:

c. State the critetion for reading a buret filled with KMnO4:

d. A solution is 0.020 M in KMnO4. A student asked to prepare 500.0 mL of Na2C2O4 solution, 25.00 mL aliquots of which will be used to standardize the KMnO4. If approximately 33 mL of KMnO4 are to be used in each titration, describe exactly how you would prepare the sodium oxalate solution. Show all calculations.

(M.W.: Na2C2O4= 134.0)

Talking about Chromatography using kool aid, 70% isopropanol, 25% isopropanol and 5% isopropanol what is the answer to the questions?

1. Describe h0w you think the separation is occurring. What is the mechanism of the separation?

2. Why do you think the consistency of the solution added to the column was changed throughout the separation? This process is called gradient elution.

3. All chromatography systems consist of a mobile phase and a stationary phase. Define the system: what is/are the stationary phase(s), mobile phase(s), sample(s), analyte(s)?

4. Rank each colored component from least polar to most polar. Justify your ranking based on the order of elution.

Use chemfinder to find the chemical structures of the dyes. Draw the structures and justify your ranking based on their structures.

5. Many analytical procedures require a separation (chromatography) step prior to the analysis. Why?

6. This lab is a “qualitative” lab. It could easily be modified to be a “quantitative” lab. Briefly describe how you could make this a quantitative lab, i.e., how could you determine the concentration of the dyes in the Kool-Aid sample?

7. Compounds need not be colored to be analyzed using chromatography. How could colorless compounds be detected in a chromatography system?

How could you dissociate a diatomic molecule, at equilibrium, without changing the temperature of the system? [Suggested key words: equilibrium constant, concentration, ratio, volume...]

This is a P-Chem problem

The haf reaction occuring in the standard hydrogen electrode "SHE" is
2H⁺ (aq) +2e- <=> H₂ (g)

a) What is the EMF for this half-cell?
b) How is the EMF value listed in part (a) above for the standard ydrogen electrode measured?
c) Why do we need a "standard reference electrode" like this hydrogen half-cell?
d) How is SHE used to determine unknown half-cell voltages?

A 100.0 mL solution containing 0.756 g of maleic acid (MW = 116.072 g/mol) is titrated with 0.217 M KOH. Calculate the pH of the solution after the addition of 60.0 mL of the KOH solution. Maleic acid has pKa values of 1.92 and 6.27.

At this pH (pH = 9.48), calculate the concentration of each form of maleic acid in the solution at equilibrium. The three forms of maleic acid are abbreviated H2M, HM–, and M2–, which represent the fully protonated, intermediate, and fully deprotonated forms, respectively.

1. A loam-textured soil has from 50 to 100 square meters of surface area per gram of soil. Assume you had 100 grams of a loam-textured soil, and its S.A. was 75 m2/g. If this S.A. could be projected on one flat surface, How many football fields of area would this equal? ( Note: A football field is 120 yards long and 160 feet in width) Show your calculations.

A student starts with   4.586 g   of unknown mixture of Na₂CO₃ and CaCl₂•2H₂O. They collect   1.356 g   of precipitate. They identified Na₂CO₃ as their limiting reagent.

How many grams of CaCl₂•2H₂O did the unknown mixture originally contain?

ive tried 3.230 and 2.898 but were both wrong.

thanks