Consider a diporitc acid, H₂A, where K_a1 = 8.41E-4 and K_a2 = 2.36E-9. Answer the following questions regarding this solution:


If the initial concentration of the acid is 0.66M, what is the pH of the solution?

What will the concentration of A^2- be at equilibrium?

Indicate how you would carry out each of the following reactions. How would you distinguish between the starting material and product by IR? Your answer should include both disappearance as well as appearance of IR absorptions.

A) 1-methylcyclohexene to trans-2-methylcyclohexanol

B) cyclohexene to cis-1,2-cyclohexandiol

C) 1-hexyne to 2-hexanone

D) 1-hexyne to 1-hexene

E) 3-chloropentane to 2-pentene

Draw the Lewis Dot Structure for the following compounds and then determine

a) the hybridization of the central atom

b) the electron group arrangement

c) the bond angle around the central atom

d) the molecular geometry.

a) H₃O⁺          

b) NO₃^-                

c) O_{3      `}                

d) HCN          

e) CH₃CH₃

A buffer contains 0.11 mol of propionic acid (C2H5COOH) and 0.17 mol of sodium propionate (C2H5COONa) in 1.20 L. What is the pH of this buffer?

What is the pH of the buffer after the addition of 0.02 mol of NaOH?

What is the pH of the buffer after the addition of 0.02 mol of HI?

ANSWER TWO OF THE FOLLOWING QUESTIONS :

A 24.1 mL sample of a 0.353 M aqueous acetic acid solution is titrated with a 0.426 M aqueous potassium hydroxide solution. What is the pH at the start of the titration, before any potassium hydroxide has been added?

pH =

A 46.1 mL sample of a 0.455 M aqueous nitrous acid solution is titrated with a 0.292 M aqueous barium hydroxide solution. What is the pH after 22.0mL of base have been added?

pH =

What is the pH at the equivalence point in the titration of a 22.8 mL sample of a 0.439 M aqueous hypochlorous acid solution with a 0.497 M aqueous sodium hydroxide solution?

pH =

A heat lamp produces 22.0 watts of power at a wavelength of 6.8 μm . How many photons are emitted per second? (1 watt = 1 J/s). The answer needs to be in s^-1

Calculate the pH at the stoichiometric point when 25 mL of 0.089M formic acid is titrated with 0.33 M NaOH.

Calculate the pH at the stoichiometric point when 25 mL of 0.096 M pyridine is titrated with 0.31 M HCl.

Calculate the pH at the stoichiometric point when 25 mL of 0.093 M nitric acid is titrated with 0.34 M NaOH.

Chapter 8: Electron Configurations and Periodicity Complete for a thumbs up!

a. Write the electronic configuration and draw the orbital diagram of iron.

b. Create a table summarizing the group traits of elements.

c. Explain why Hund's rule is incredibly important. Use examples or images to help back up your explanation

d. In the science field, chemists often use NMR for confirmation of the structure of newly synthesized drugs. This is what MRIs do to humans at hospitals. Please explain what these machines are doing at an atomic level. Use your own words, and try your best to relate it to the material covered in this chapter

Given the pH and absorbance of a solution. What equation would i use to find the

1.equilibrium concentration of the base? 2. equilibrium concentration of the acid?

Fischer Synthesis of Isopentyl Acetate

Data:

Inital Amounts: 1mL Isopentyl alcohol + 1.5mL glacial acetic acid

amount of product collected = 1.727 g

Question: Was the reaction successful? What was the actual yield? (You may need to do some unit conversions for this) Please explain as well

1. Imagine that you model your lungs as a 5 L sealed balloon at sea level: How would the pressure and temperature at 100 m below sea level affect the speed of the air molecules in your lungs compared to their speed at sea level? Assume that the temperature of your body will adjust to the surrounding temperature as you descend. Keep in mind that, in general, your breathing adjusts to keep the same number of particles of air in your lungs at different depths.

2. When is the effect of particle size on the average pressure larger, at small or at large volumes?

Show all of your work. Use the half-reaction method

Li(s)+ Co2(aq)+→Li(aq)+ +Co (s)

Mg(s)+ CuSO4(aq)→MgSO4(aq)+Cu(s)

12. For each of the four problems below, consider the two pairs of atoms/ions/molecules. Which pair (i or ii) would be attracted to one another by the strongest intermolecular interaction? Justify your answer, making sure to name the type(s) of intermolecular interaction(s) that are involved in each case. You will receive no credit without a proper justification.

a. (5 points) i) Two argon atoms OR ii) two xenon atoms?

b. (5 points) i) Two NH3 molecules OR ii) two PH3 molecules?

c. (5 points) i) A Cl- ion and a K+ ion OR ii) a water molecule and a K+ ion?

d. (5 points) i) A Cl- ion and a K+ ion (dissolved in methanol, dielectric constant 33) OR ii) a Cl- ion and a K+ ion (dissolved in water, dielectric constant 78).