Inorganic Chemistry Answers

What is the PH of a buffer solution containing 0.2moldm^-3 ethanoic acid and 0.5moldm^-3 sodium ethanoate?Ka=1.75×10^-5 moldm^-3

An aqueous solution of ethanoic acid has a concentration of 10^-2 moldm^-3. The dissociation constant of the acid is 1.7×10^-5 moldm^-3, calculate the following

1)PH of the acid

2) Concentration of H+

3) concentration of OH-

4)Degree of dissociation of the acid

Using the appropriate gas laws, calculate the quantities denoted by the blanks below.

Conditions before Conditions after

n₁, mol V₁, L P₁, atm T₁, K n₂, mol V₂, L P₂, atm T₂, K

1.25 13.2 1.27 298 1.25 (a)____ 0.987 298

1.25 13.2 1.27 298 1.25 (b)____ 1.27 407

1.25 13.2 1.27 298 4.00 (c)____ 1.27 298

1.25 13.2 1.27 298 1.36 (d)____ 1.27 372

1.25 13.2 1.27 298 1.25 30.5 (e)____ 298

A typical 11B – 1H bond has a stretching frequency of 2400 cm-1. Based on your understanding of isotopic effects on vibrational frequencies, and their connection to bond strength, rank the B – H bonds from weakest to strongest. Consider the most common isotopes of the B – H bonds highlighted below. 

Make sure to explain your ranking.

 10B – 1H,  10B – 2H,  11B – 1H,  11B – H 

The made up element Imaginarium (Im) has an atomic number of 119. Im has been imagined to exist in 

three isotopic forms shown in the table below. 

Im isotope Isotopic mass (kg)

291Im  4.871 X 10-25 

302Im  5.055 X 10-25 

319Im  5.340 X 10-25 

Rank the Im isotopes from least to most stable and explain your reasoning

1.   Calculate the number of grams of helium in a 1.00 L balloon at 27.0∘∘C and under 1.00 atmosphere of pressure.

Calculate the number of grams of helium in a 1.00 L balloon at 27.0LaTeX: ^\circC and under 1.00 atmosphere of pressure.

Plot the curves for the redox potential of a solution over pH 5.0-10.0 containing chlorine, bromine and iodine.

Examine the ratio of total dissolve arsenite [As(III)] to total dissolved arsenate [As(V)] at a pH of 6.0 and a pe of 5.0, considering all the acid/base reactions that those species undergo.

What concentration of HOCI is required to oxidize 20mg/L NH₃-N to N₂?