Chemistry Problem Solving Videos @ WVU

Chem 116 - General Chemistry II

Acids and Bases

Classification of Lewis Acids and Bases

Do NCl3 and C2H5OH act as Lewis acids or Lewis bases? Can they act as Bronsted-Lowry acids and bases?

Video Solution

Do the Following Ions Hydrolyze in Water?

Do the following ions hydrolyze in water? If so, what type of solution results, an acidic or a basic solution?

ClO4-
ClO2-
Fe2+
Ca2+
C6H5NH3+
CO32-


Video Solution

Acids and Bases I

A research chemist adds a measured amount of HCl gas to pure water at 25 C and obtains a solution with [H3O+] = 3.0 X 10-4 M. Calculate [OH-].

 

Is the solution acidic, neutral, or basic?
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Acids and Bases II

In an art restoration project, a conservator prepares copper-plate etching solutions by diluting concentrated HNO3. Calculate [H3O+], pH, and [OH-] of the solution at 25 C.

 

Is the solution acidic, neutral, or basic?
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Acids and Bases III

Calculate the pH of an aqueous ammonia solution that has [OH-] = 1.9 X 10-3 M.
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Acids and Bases IV

Calculate the pH of a 2.0 X 10-10 M HNO3 solution.
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Acids and Bases V

Acetylsalicylic acid (ASA, CH3COOC6H4COOH) is the active ingredient in plain aspirin. It has a Ka value of 3.6 X 10-4.

 

What is the percent dissociation of 0.10 M of ASA?

 

What is the percent dissociation of 0.0010 M of ASA?
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Acids and Bases VI

Dimethylamine (CH3)2NH, a key intermediate in detergent manufacture, has a Ka of 5.9 X 10-4. What is the pH of 1.5 M (CH3)2NH?
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Acids and Bases VII

Calculate the pH, percent ionization, and concentration of all species present in a 0.10 M HCN solution. Ka (HCN) = 4.9 X 10-10.
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Acids and Bases VIII

What is the pH and percent ionization of a 0.40 M ammonia solution. Kb of ammonia = 1.8 X 10-5.
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Acids and Bases IX

Predict whether the following salt solution is neutral, acidic, or basic. Calculate the pH. Hint: Write the equation for dissociation of the salt and any equilibrium established.

 

0.10 M AlCl3; Ka of Al(H2O)63+ = 1.4 X 10-5
Video Solution