pH of a Solution When Weak Acid and Strong Base are Mixed

What happens to the pH of a weak acid as you add strong base to it?

For example, aqueous sodium hydroxide solution (NaOH_(aq)) is a strong base and acetic acid (CH₃COOH_(aq)) is a weak acid.

If you add 10 mL of 0.20 mol/L NaOH_(aq) to 25 mL of 0.10 mol/L CH₃COOH_(aq), what is the pH of the resultant solution?

Find out how to work this out, and work through other examples with worked solutions at AUS-e-TUTE.

A "free-to-view" tutorial is available at https://www.ausetute.com.au/phmixwasb.html

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pK

You've probably heard of pH, maybe even pOH, but what is pK?
Does this sound like brand of chewing gum to you?
Or does that "p" mean something?
Time to find out, with AUS-e-TUTE's new pK resources!

https://www.ausetute.com.au/pk.html

What is the pH of a Strong Base After You Dilute It?

The problem with strong bases like sodium hydroxide and potassium hydroxide are that they absorb moisture from the air making it difficult to accurately weigh them. So we rely heavily on obtaining an accurately known concentration for an aqueous solution of a strong base (using titration techniques for example) and then diluting this stock solution to produce new, dilute solutions of known concentration and pH.
When you dilute an aqueous solution of a strong base :

• hydroxide ion concentration decreases (towards 10^-7 M)
• pOH increases (towards 7)
• hydrogen ion concentration increases (towards 10^-7 M)
• pH decreases (towards 7)

Visit AUS-e-TUTE's new tutorial to understand why, then log-in to the Members ONLY area to play the game, answer test and exam questions (which give you instant feedback), take the quiz, or, just for teachers, you could make a printable worksheet or quiz.

Calculations for Strong Bases

AUS-e-TUTE has just added new resources!
As part of the update of our "Acids and Bases" topic, tutorials, games, tests, and exams have been added for the following:

• pOH Concepts
• Strength of Bases
• Calculating the pOH of Strong Bases (aqueous solutions)
• Calculating the Hydroxide Ion Concentration of Strong Bases (aqueous solutions)
• Calculating the pH of Strong Bases (aqueous solutions)
• Calculating the Hydrogen Ion Concentration of Strong Bases (aqueous solutions)

AUS-e-NEWS March 2013

Since the 1960's, superacids have become an essential tool in industry.

Without the powerful ability of superacids to react with, and break down, raw petroleum we would not have a supply of cheap, high-strength plastics.

But what is a superacid?

Read this super issue of AUS-e-NEWS to find out !

Links to the following new resources can be found in the Test Centre (http://www.ausetute.com.au/members/testcent.html)

                - Properties of Acids and Bases (tutorial, game, test)

                - Definitions of Acids and Bases (tutorial, game, tests, exams)

                - pH Scale (Tutorial, game, test, exam)

                - pH Calculations, introductory (tutorial, game, test, drill)

                - pOH Calculations, introductory (tutorial, game, test, drill)

                - Hydrogen Ion Concentration calcuations, introductory (tutorial, game, test, drill)

                - Hydroxide Ion Concentration Calculations, introductory (tutorial, game, test, drill)

                - Strength of Acids (Tutorial, game, test,exams)

                - Strong Acid pH Calculations (Tutorial, game, test, exam)

                - Strong Acid Hydrogen Ion Concentration Calculations (Tutorial, game, test, exam)

                - Strong Acid Hydroxide Ion Calculations Calculations (Tutorial, game, test)

                - Strong Acid pOH Calculations (Tutorial, game, test)

                - Oxidation of Alkenes (tutorial, game, test, exam)

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