1. in what context do the terms hydrophobic and hydrophilic relate to the soulubilites of substance in water?
2. in each of the following pairs of compounds which compound is likely to be more souble in CC14?
(a) Br2 or NaBr
(b) CH3CH2OH or CH3OCH3
(c) Cs2 or KOH
(d) I2 or CaF2
3. which sulfur conpound would you predict to be more souble in nonpolar solvents: SO2 or CS2?
4. methanol has a larger molar mass than water, but boils at a lower temperature. Suggest a reason why?
5. How is it that the dipole moment of HCI(1.08D) is larger than the dipole moment of HBR (0.82D) yet HBR boils at a high temperature?
6. why is methanol miscible with water but methane is not?

In the qualitative analysis scheme, magnesium and nickel precipitate from solution upon the addition of sodium hydroxide. Once separated from the remaining cations by filtration or decanting, the solid mixture is acidified and warmed to dissolve magnesium and nickel cations back into solution. Adding ammonia creates a buffer solution. (Remember, HCl and NH₃ makes for NH₄⁺ cation.) The buffered solution should just be basic (say, pH = 8). Adding sodium hydrogen phosphate (Na₂HPO₄) precipitates magnesium as MgNH₄PO₄ (Ksp = 3 x 10^-13).

a)Write the dissociation equation and corresponding Ksp expression

b)Calculate the molar solubility of the compound

Part 1) Solvent trapping is used for

a) analysis of trace components.

b) analysis of high-boiling major components.

c) analysis of low-boiling major components.

Part 2) Open tubular columns of less than 0.53 mm in diameter:

a) cannot be used for on-column injection of analyte with a standard injection needle.

b) do not give resolution as good as that of wider columns.

c) are excellent when used with thermal conductivity detectors.

Mechanism of Adsorption

Adsorption mechanism includes physical adsorption and chemical adsorption.

How well would the following compounds be adsorbed on (I) biochar and (II) clay?

1. Na⁺
2. NO₃^–
3. Dioctyl phthalate

Explain the answers in terms of physical adsorption and chemical adsorption.

A beaker with 125 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 mol L−1. A student adds 7.00 mLof a 0.360 mol L−1 HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.760. Express your answer numerically to two decimal places. Use a minus (−) sign if the pH has decreased.

Contrast ideal vs. nonideal/real gases, and explain why very high pressure and very low temperature gases behave nonideally. (6 points)

Decide the mechanism by which the following alkyl halides will be converted to alcohols by the substitution of the nucleophile, OH-.

The options are: SN1, SN2, more information needed

1-bromo-2,3-dimethylbutane
2-chloro-2,3,3-trimethylbutane
4-iodo-3-ethylhexane
3-chloro-2,2-dimethylbutane

Complete the following table by calculating the missing entries. In each case indicate whether the solution is acidic or basic.

I need help on each row of these.

An ideal monatomic gas at an initial temperature of 500 K is expanded from 5.0 atm to a final pressure of 1.0 atm. Calculate w, q, DU, and (where applicable) DH and DT when the expansion is performed (a) reversibly and isothermally, and (b) reversibly and adiabatically.

Help Please!!!

Dimethyl ether Ch3-o-CH3 and ethanol ch3ch2oh have the same molecular formula. Dimethyl ether evaporates faster than ethanol, which is at same temperature. Explain these observations??

A sample of KIO3 weighting 0.1040 grams was added to an HCl solution containing excess KI. The liberated I2 requried 34.6 mL of Na2S2O3 solution in the titration. calculate the molarity of the thiosulfate solution, using the overall equation ------> KIO3+6HCl+6Na2S2O3------>3S4O62-+I-+3H2O IKIO3:6Na2s2o3

As a chemist for an agricultural products company, you have just developed a new herbicide,"Herbigon," that you think has the potential to kill weeds effectively. A sparingly soluble salt, Herbigon is dissolved in 1 M acetic acid for technical reasons having to do with its production. You have determined that the solubility product Ksp of Herbigon is 9.50×10⁻⁶.

Although the formula of this new chemical is a trade secret, it can be revealed that the formula for Herbigon is X-acetate (XCH3COO, where "X" represents the top-secret cation of the salt). It is this cation that kills weeds. Since it is critical to have Herbigon dissolved (it won't kill weeds as a suspension), you are working on adjusting the pH so Herbigon will be soluble at the concentration needed to kill weeds. What pH must the solution have to yield a solution in which the concentration of X+ is 1.50×10⁻³M ? The pKa of acetic acid is 4.76.

Express your answer numerically. Answer is not 2.46!

1. Calculate the grams of NaCH₃COO required for 150.0 mL of 0.20 M CH₃COOH solution to achieve a pH of 4.40. (Assume no volume change.)  (K_a = 1.8 x 10^-5 )

2. What is the pH of 100.0 mL of buffer consisting of 0.20 M CH₃COOH/0.20 M NaCH₃COOafter 15.0 mL of 0.25 M HCl was added into the solution? (K_a = 1.8 x 10^-5)

3. Are the following solutions reasonable buffers? Please provide an explanation for each answer.

1. 1.0 M H₃PO₄ and 1.0 M NaH₂PO₃
2. 1.0 M H₂SO₄ and 1.0 M HCl
3. 1.0 M NaOH and 0.50 M HCl

An experimental protocol calls for 25.4 mL of a solution in which the potassium ion concentration is 0.0872 M. How would you prepare this solution from pure solid potassium phosphate? (The solvent is water.)

(Please don’t forget to state how you would prepare the solution; don’t simply calculate the grams of potassium phosphate required.)