Neutralize Em! December √100, 2.009 *103 Objective: SWBAT predict the products of acid-base neutralization reactions Catalyst: Write down the balanced equation for the reaction of Sodium Chloride with Aluminum Oxide

Agenda Do Now/Announcements Finish pH calculations Finish Lab Analysis Ionization Equations Neutralization Reactions Work Time Exit Ticket

Hmmm…Acid inside of me? The human stomach produces hydrochloric acid (HCl), commonly known as "stomach acid“ or “stomach juice” Stomach acid is made when you eat something, but when a person eats something requiring the stomach to work EXTRA hard—say, a pizza—the stomach may generate EXCESS hydrochloric acid, and the result is HEARTBURN

Inside your insides… the human stomach When this happens, people often take antacids, which contain chemicals such as… aluminum hydroxide (Al[OH]3) or magnesium hydroxide (Mg[OH]2) What do these chemicals have in common?

HCl + Al(OH)3 → THEY ARE BASES!!!!!! DUH Mr. Jhaveri! True…taking an antacid when there is excess acid in your stomach neutralizes the acid. HCl + Al(OH)3 → We learned about 5 types of reactions…What type of reaction is this??

Example: MgO + CaS FLASHBACK!!!!!!!  + + A double-replacement reaction is one in which ions switch places. AX + BY  AY + BX Two couples are dancing and decide to switch partners! Example: MgO + CaS S O  Mg Ca + O S Mg Ca +

Back to Reality… HCl + Al(OH)3 → AlCl3 + H2O THEY ARE BASES!!!!!! DUH Mr. Jhaveri! True…taking an antacid when there is excess acid in your stomach neutralizes the acid. HCl + Al(OH)3 → We just turned that aggressive acid into neutral old water… So, What will be the products of this reaction? DON’T FORGET TO KRISS KROSS! AlCl3 + H2O Go through the steps goshdarrnnnit

Back to Reality… HCl + Al(OH)3 → AlCl3 + H2O THEY ARE BASES!!!!!! DUH Mr. Jhaveri! True…taking an antacid when there is excess acid in your stomach neutralizes the acid. HCl + Al(OH)3 → We just turned that aggressive acid into neutral old water… So, What will be the products of this reaction? DON’T FORGET TO KRISS KROSS! AlCl3 + H2O Go through the steps goshdarrnnnit

Neutralization! KEY POINT #1: A neutralization reaction is a double-replacement reaction in which an acid and a base react in to produce water and a salt Now…A salt is NOT just NaCl (table salt…) A salt is an ionic compound made up of a cation from a base and an anion from an acid Acid + Base  Water + Salt HY + X(OH)  H2O + XY DON’T FORGET TO KRISS-KROSS!!!! ACID BASE WATER SALT

Neutralization Reactions Write the balanced chemical reaction for hydrochloric acid and Sodium Hydroxide HCl + NaOH →NaCl + H2O ACID BASE SALT WATER

Ionization Equations What happens if we just place an acid or base in water? It Ionizes, or breaks up into ions Key Point #2: An ionization equation shows the ions that result when an acid or base is dissolved in water H2SO4 H+ (SO4)2-

Ionization Equations Key Point #3: An ionization equation shows the cation (+) and anion (-) that result when an acid or base dissociates when dissolved in water H2SO4  How do we know that H2SO4 becomes H+ and (SO4)2-? Because it is an ionic compound! We had to Kriss Kross to get the subscripts! H2SO4 H+ (SO4)2- 2H+ + (SO4)2-

Ionization Equations Write the ionization equation for the dissociation of the following acids and bases: Sulfuric Acid (H2SO4) Barium Hydroxide

Ionization Equations Write the ionization equation for the dissociation of the following acids and bases: Nitric Acid (HNO3) Ammonium Hydroxide

Practice!

Exit Ticket Write the balanced equation for the following acid- base neutralization Lithium hydroxide and Hydrochloric Acid If you take a Tums with 4.5x10-5M [OH-] and there is 5.5x10-9 M [H+] will all of the acid be neutralized?