Webquest Learning Acids and Bases Purpose and Getting

Webquest Learning: Acids and Bases

Purpose and Getting Started • This webquest is to build your knowledge and understanding so you can answer most or all of the questions on the pre-assessment. • Please read each page carefully. And answer all questions that are typed in red on the answer sheet provided. • Follow the links to find information about each topic or search out your own links to find the information- but remember to use your time wisely.

About Sources • Some questions provide links as a useful starting point. If no links are provided do your own search on Google or other search engine. • You may go to Wikipedia but realize it is NOT always the best source of information. • When in doubt, you should use two or more sources that agree. A site with. edu, . org, is typically more reliable. • Google is NOT a source. A source is a website that delivers the specific information. Google is like the library-you don’t say your source was the ‘library. ’

Why Do We Care? • Acids and Bases have been known and used for thousands of years • They are an important class of chemical compounds and react in predictable ways • List 3 uses for acids and bases over the years 1. _____________ 2. _____________ 3. _____________

The “Basics” • • Physical Properties of acids include • Taste: _________ • Feel : _________ • ____________ Physical Properties of bases include • Taste: _________ • Feel: _________ • ____________

Arrhenius Model/Bronsted-Lowry Model Arrhenius Bronsted-Lowry Arrhenius says acids do this Bronsted-Lowry says acids do this Arrhenius says bases do this Bronsted-Lowry says bases do this Acid Base

Strong or Weak? • How does a strong acid differ from a weak acid in how it gives up, or ‘dissociates’ the H+ (or donates the proton) _______________ • How does a strong base differ from a weak base in how it gives up, or ‘dissociates’ the OH- (or accepts the proton) _______________

Draw It/Write It • Go to the inspiration application on your computer and make a brief web map to illustrate the differences between strong and weak acids/bases • OR • You may write a brief poem or a song to describe the differences between strong and weak acids/bases • If time allows groups will present their creative works

Hydronium Ion • Write the molecular formula for the hydronium ion (with charge shown) • See the animation on how the hydronium ion is formed when water splits into hydronium ion and OH- hydroxide ion (the red ball is a H+ ion) at

p. H scale • See the p. H and p. OH scale at the BOTTOM of: • Enter thhe p. H/p. OH scale range below • From: _ __________To: __ _______ • The p. H range for acids is from ________to ________ • The p. H range for bases is from _____ to _______ • The p. H of pure distilled water is • The p. H of stomach acid is about ________ • Can you explain the relationship between exponent in the hydronium concentration [H 3 O+] (the 5 in 1 x 10 -5 ) and p. H? _________

Acid Base Reactions Go to the BOTTOM of the page at: or look at: • When an acid and base react they form two new compounds, a • 1)_ __and 2)_ _______ • So the following reaction between hydrochloric acid and sodium hydroxide in acqueous solution would produce the following two products HCl + Na. OH ---> ____ + _____

Learn Some Definitions • Amphoteric means ______ • Titration means _______ • Monoprotic and Polyprotic mean ______ • Buffer for acids and bases means _______ • (try looking on your own for these)

Why Do We Care? • Acids and Bases have been known and used for thousands of years • They are an important class of chemical compounds and react in predictable ways • List 3 uses for acids and bases over the years 1. _____________ 2. _____________ 3. _____________

The “Basics” • • Physical Properties of acids include • Taste: _________ • Feel : _________ • ____________ Physical Properties of bases include • Taste: _________ • Feel: _________ • ____________

Draw It/Write It • Go to the inspiration application on your computer and make a brief web map to illustrate the differences between strong and weak acids/bases • OR • You may write a brief poem or a song to describe the differences between strong and weak acids/bases • If time allows groups will present their creative works

Hydronium Ion • Write the molecular formula for the hydronium ion (with charge shown) • See the animation on how the hydronium ion is formed when water splits into hydronium ion and OH- hydroxide ion (the red ball is a H+ ion) at

p. H scale • See the p. H and p. OH scale at the BOTTOM of: • Enter thhe p. H/p. OH scale range below • From: _ __________To: __ _______ • The p. H range for acids is from ________to ________ • The p. H range for bases is from _____ to _______ • The p. H of pure distilled water is • The p. H of stomach acid is about ________ • Can you explain the relationship between exponent in the hydronium concentration [H 3 O+] (the 5 in 1 x 10 -5 ) and p. H? _________

Learn Some Definitions • Amphoteric means ______ • Titration means _______ • Monoprotic and Polyprotic mean ______ • Buffer for acids and bases means _______ • (try looking on your own for these)

Avoid Misconceptions • Finally, take a look at the common misconceptions people have about acids and bases • Does this correct any misconceptions you might have had? Explain.

Avoid Misconceptions • Finally, take a look at the common misconceptions people have about acids and bases • Does this correct any misconceptions you might have had? Explain.

Checklist • Make sure you complete all the information asked for on the slides (due today) • When done turn both the answers and the creative work in.