Can you use phenolphthalein to titrate a colored solution? Explain please! I can't figure this out.

The specific rate constant for the first-order decomposition of N2O5(g) to NO2(g) and O2(g) is 7.48×10−3s−1 at a given temperature.

Part A:

Find the length of time required for the total pressure in a system containing N2O5 at an initial pressure of 0.110 atm to rise to 0.150 atm . Express your answer using two significant figures.

Part B:

Find the length of time required for the total pressure in a system containing N2O5 at an initial pressure of 0.110 atm to rise to 0.220 atm .Express your answer using two significant figures.

Part C:

Find the total pressure after 120 s of reaction.

(1) Briefly explain the similarities and differences between nitric oxide oxidation and sulfur dioxide oxidation in the troposphere. (10 points possible)

the product in a Coumarin synthesis lab is soluble in aqueous base. Why?

1.The base deprotonates α- to the carbonyl to form an enolate ion.

2.The base deprotonates α- to the phenol to form a phenylate anion.

3.The base deprotonates the phenol hydroxyl to form a phenoxide anion.

4.The product is water soluble.

The solubility of Mg₃(AsO₄)₂ in water is 0.685 g in 0.935 L of water at a given temperature. What is the value of K_sp for Mg₃(AsO₄)₂? (The molar mass of Mg₃(AsO₄)₂ is 350.7 g/mol)

What is the pH of a buffer solution containing 0.410 M hypochlorous acid (HOCl) and 0.050 M (sodium hypochlorite) NaOCl? (Ka(HOCL))=3.2*10^-8

Please show work.

Which of the following names is correct?

The Cherry Kool Aid dispensed from the burette was prepared as per the package instructions. The suggested serving size of Kool Aid is 8.0 ounces. How many moles and grams of red 40 (MW=496.42g/mol) are found in a serving fo Cherry Kool Aid? ( HInt: Use the concentration of undiluted Kool Aid you determined in the lab= 0.092mM )

Calculate [OH?] and pH for strong base solution formed by mixing 15.0mL of 1.00

What volume, in milliliters, of 0.160 M0.160 M NaOH NaOH should be added to a 0.140 L0.140 L solution of 0.021 M0.021 M glycine hydrochloride (pKa1=2.350,Ka1=2.350, pKa2Ka2 = 9.7789.778) to adjust the pH to 2.61?

The pkb values for the dibasic base B are pkb1 = 2.10 and pkb2 = 7.34. Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.50 M B(aq) with 0.50 M HCl (aq).

a) before addition of any HCl d) after addition of 75.0 mL of HCl

b) after addition of 25.0 mL of HCl e) after addition of 100.0 mL of HCl

c) after addition of 50.0 mL of HCl

Deducing a Reaction Mechanism for the Isomerization of Maleic acid to fumaric acid. I'm completing my organic chemistry lab report and answering questions and I have very confused and would appreciate any help and explanation please. I appreciate it.

Possible Mechanisms for the Isomerization.

1. Maleic acid is activiated by visible light, and then rearranges to form fumaric acid. In this mechanism, the pi-bond is momentarily broken, allowing for the free rotation to give the more stable trans isomer. The double bond then reforms.

2. The rearrangement of maleic acid to fumaric acid is accomplished by the thermal excitation of the molecule. In this mechanism, the pi-bond is broken by the application of heat. As described above, this would allow rotation to occur and form the more stable trans isomer.

3. A nudeophilic addition of a chloride ion to maleic acid again permits free rotation, followed by release of the Cl- ion to produce fumaric acid.

4. An electrophilic addition of a proton to maleic acid, followed by rotation and then deprotonation.

5. Water adds to maleic acid (under acid catalysis) to form laic acid. Malic acid then rotates to a new conformation and elimenates water to form fumaric acid.

6. The addition of a proton to maleic acid leads to the formation of a lactone (cyclic ester) which undergoes a ring opening reaction to yield malic acid. Malic acid is then dehydrated to give fumaric acid.

7. A proton adds to the carbonyl oxygen to give an intermediate with a number of resonance structures. One of these resonance structures can freely rotate and deprotonation to give fumaric acid.

8. A proton adds to the carbonyl oxygen, followed by an addtion of a chloride ion. The product of this 1,4 addition then undergoes a free rotation, and hydrochloric acid is eliminated to produce fumaric acid.

So, I understand that I can go through a process and eliminate the first 7 reaction mechanisms to chose the last one #8 is close to the true state of affairs.

But I am struggling answering these questions, if anyone can help and provide an explanation I'd greatly appreciate it.

Questions #1: 1. Is visible light solely responsible for the isomerization of maleic acid to fumaric acid? Explain.

2. If the isomerization of maleic acid to fumaric acid is a thermal effect, which test tubes should contain fumaric acid?

3. For mechanism 3 to be correct, which test tubes should contain fumaric acid?

4. For mechanism 4 to be correct, which test tubes should contain fumaric acid?

5. For mechanism 5 to be correct, which test tubes must contain fumaric acid?

6. Which test might rule out mechanism 6 as a possibility?

7. For mechanism 7 to be correct, which test tubes must contain fumaric acid?

8. For mechanism 8 to be correct, which test tubes must contain fumaric acid?

Then these questions:

1. Does sulfuric acid, which ionizes to give a negatively charged sulfate ion, induce the isomerization of maleic acid to fumaric acid? Explain.

Anybody answer this?

What are some explanations for a yield going above 100%? Referring specifically to a yield produced when re-using products from a previous experiment (re-using recovered NaI to produce CuI).

how many moles are in 6ml of 85% H3PO4? and how many grams of sodium carbonate are needed to neutralize this acid?