Neutralization Reactions

In a clean, small container (glass vial or small paper cup), place about ten drops of an ammonia cleaner and two “squirts” of cabbage juice indicator.

Use a clean medicine dropper and count the number of drops of vinegar required to change the color of the solution from green to purple.

Repeat the above tasks with pickle juice or some solution that you found to have an acid pH slightly higher than vinegar.

Create a data table that summarizes your results of the two titrations.

Neutralization Reactions – comparison of two acid solutions neutralizing a base cabbage juice + ammonia solution

Insert Table Here

In the titration of ammonia solution with vinegar, and with another acid solution with a slightly higher pH value, how did the amounts needed for the neutralization of the ammonia (signaled by the change from green to purple in the solution containing the ammonia and cabbage juice) compare? How does this comparison match the differences in pH values? What is the basis of any correlation between starting pH values of the two acids and amount required to neutralize the same amount of vinegar solution? Provide explanations for each for the three questions.

Carbonyl bromide, COBr2, decomposes to CO and Br2 with and equilibrium constant of Kc of 0.190 at 73C.
COBr2(g) <--> CO (g) + Br2 (g)
if 0.015 mol COBr2 is in a 2.50 L flask at equilibrium, what are the concentrations of CO and Br2 at equilibrium?

Antifluorite structure (A2B) occurs when anions occupy lattice positions and cations occupy eight tetrahedral lattice sites of f. c. c. One of the best examples which has this structure is Li2O. The ionic radii of Li+ and O2- are as follows : rLi+ = 0.068 nm and rO2- = 0.140 nm. (20 points) a) Draw the antifluorite unit cell of Li2O and show the Li+ and O2- ions in the unit cell. State the equivalent positions of Li+ and O2- ions in the unit cell. How many net ions of each are there in the Li2O unit cell? Why? Provide explanations. How many formula units are there per this unit cell? b) Determine the number of nearest neighbors or the coordination number (C. N.) of each ion in the Li2O unit cell. Provide explanations, if necessary. c) Calculate the ionic packing factor (IPF) of the Lii2O unit cell. d) What are the closed-packed planes in the Li2O unit cell? Express their Miller indices. On this basis, determine the stacking sequence of the Li2O unit cell. (Hint : Use A, B, C for one kind of ion and use , ,  for the other kind)

The corundum (Al2O3) has a rhombohedral Bravais lattice, but it closely approximates a hexagonal lattice and is usually regarded as hexagonal. There are 30 ions per lattice site (and per unit cell). The Al2O3 formula requires that these 30 ions be divided as 12Al3+ and 18 O2-. The Al2O3 structure closely approximates close-packed O2- sheets with two-thirds of the small interstices between sheets filled with Al3+. In other words, close-packed O2- ion containing layers have repeated stacking and the Al3+ ions fill two-thirds of the octahedral interstices between adjacent layers. (22 points) The density of Al2O3 is Al2O3 = 3.8 gram/cm3, Atomic masses are : MAl = 26.98 gram/mol, MO = 16.00 gram/mol Ionic radii are : rAl3+ = 0.05 nm, rO2- = 0.14 nm a) Draw 3 layers/sheets of O2- ions and Al3+ ions in between them. b) Draw the corundum unit cell and show the O2- and Al3+ ions in the unit cell. c) How many Al2O3 molecules are there in 1 cm3 ? How many atoms are there in 1 cm3 of Al2O3? d) How many Al2O3 molecules are there in 1 gram? How many atoms are there in 1 gram of Al2O3? e)Calculate the atomic packing factor of Al2O3

You have a 5.00 g sample of an unknown compound. After analysis you find that its percent composition is 54.5% carbon, 9.10% hydrogen and 36.4% oxygen.

What is the empirical formula for this compound?

If the molar mass of this compound is 132 g/mol, what is its molecular formula?

When you are waiting for the crystals to appear in a recrystallisation experiemnt you should not cool the flask from hot to ice cold because you will cause ......... to happen rather than crystallisation.

1. You have 0.95ft^3 aluminum(density=2700kg/m3,MW=26.98). Calculate the mass in kg, lbm, gmole and lbmole.

2. Assume there are 39 inches in a meter.What is the external surface area in the SI system of a sphere that is 9.0 inches in diameter? Determine the volume in cubic feet. (Note SI system: meters / kg / Newtons etc.)

3. If a US gallon has a volume of 0.134 ft3 and a human mouth has a volume of 0.950 in3, how many mouthfuls of water are required to fill a 7.5 US gallon can?

4. Convert the following:

a) 3.9cm/s to ft/min

b) 187 lbm ft/min2 to kg cm/s2

c) 55 ft3 to gallons

d) 920mg to ounces

e) 2lbm/ft.hr to g/cm.s

5. Water at 4C has a density of 1.0g/cm3 and a molecular weight of 18. What is the density in the following units:

a) kg/m3

b) lbm/ft3

c ) kmol/L

6. Do the following conversions:

a) 1.6 x 10^-2 g cm-1s-1 to lbm ft-1 s-1
b) What is the molecular weight of propionic acid (C2H5COOH).

c) How many kg are there in 10 lb mol of sodium hydroxide (NaOH)

Dissolve 1 mole of Succinic Acid into 1 Liter of water. What is the pH of the solution? What is the molarity of the protonated and depronated forms of Succinic Acid?

calculate the molar volume of hydrogen gas using the newton-raphson method 40 atm and 300 K

R=0.08206 dm³ atm K^-1

for Hydrogen Van der Waals constants a=0.244 dm⁶ atm mol^-2 ,b=0.0266 dm³ mol^-1    

consider the rotation of 50.0mL of a 0.2M HNO3 with 0.10M NaOH calculate the pH of the solution

a) before any extra NaOH has been add
b) after 50mL of NaOH
c) add 100mL of NaOH
d) add 150mL of NaOH

Is Atomic Mass and Atomic Weight the same terms? Or is Atomic mass and Mass Number the same terms?

On the MCAT Kaplan books it says that atomic mass and mass number are the same thing but online and other chemistry textbooks, atomic mass and atomic weight are the same thing.

Can someone please clarify which two terms are the same thing or are they all different? I really need help to make sure I understand this for the MCAT.

suppose that the reservoir contains 1.5L of 2.0M K2PO4. For how many hours can the reservoir provide 20mM KOH at a flow rate of 1.0 ml/min if 75% consumption of K+ in the reservoir is feasible

22. Draw the structure of two steroid hormones and name their use in humans.  

23. Draw 3 amino acid structures explain their primary uses and sources of the amino acids.

24. Explain the four components of the protein tertiary structure.

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