1 22 What Are Strong Acids And Bases

Launch: 1/22   Grab your binder and immediately take a seat!   Place launch paper and practice questions (Tuesday 1/19) on your desk.   Tuesday’s Exit Slip Data: 96%   Today’s Objective: I can define a Brønsted-Lowry acid and base.

Launch 1/21 1.  Which of the following is true about acids? a.  they taste bitter b.  they turn litmus paper blue c.  they have a pH of greater than 7 d.  they taste sour and turn litmus paper red

Launch 1/21 2.  Baking soda is an example of an a.  acid because it turns litmus paper red b.  base because it has a pH of about 8.5 c.  acid because it turns litmus paper blue d.  base because it tastes similar to lemons

Launch 1/21 3.  Which of the following solutions would have the highest acidity? a.  pH 11 b.  pH 9 c.  pH 5 d.  pH 2

Launch 1/21 4.  Which of the following explains why Kool-aid powder dissolves in water? a.  The Kool-aid powder is cold and therefore has a high solubility. b.  The random motion of the solvent molecules causes collisions with the solute molecules and dissolving occurs. c.  The solute has strong intermolecular attractions and is therefore easily dissolved. d.  The concentration of the solute is higher than the concentration of the solvent and dissolving occurs.

Announcements   Missing work is due today   Check board for your name   Quiz tomorrow!   Short quiz – 15 MC   Lab questions due tomorrow!   Unit #6 exam moved to Thursday 1/28

January Calendar

What are strong acids/bases? Mr. Heffner 1/22/10

What are strong acids/bases? “break up”   Strong acids/bases…   fully dissociate in solution HCl  H+ + Cl– NaOH  Na+ + OH– H+ Cl- Na+ OH- Hydrogen H+ Chloride SodiumNa+ Hydroxide Cl- H+ ion ionOH- ion H Cl- HCl Cl + ion H+ - Na NaOH OH - + Na+ Na+ OH- H+ H+ all Na+ Na+ Cl- Cl- broken OH- OH- up

What are weak acids/bases? “break up”   Weak acids/bases…   only partially dissociate in solution HF  H+ + F– HF F- H+ F- HF F- HF H + HF F- H+ partially HF broken F- F- up

Summary Strong acids/bases Weak acids/bases   fully dissociate   partially dissociate HCl  H+ + Cl– HF  H+ + F– H+ Cl- HF F- H Hydrogen + H+ Cl- F- H Cl HCl Cl + ion - H + H+ - F- HF HF H + HF F- H+ H+ H+ HF Cl- Cl- F- F- Video Summary

What are strong acids/bases?   What happens if you mix a strong acid and a strong base? HCl + NaOH  ? H+ + Cl- + Na+ + OH-  ? 2O + NaCl H water salt   strong acid + strong base = water + salt   Neutralization

Practice Questions   Practice question worksheet

Exit Slip 1.  Which of the following are properties of acids? a.  they taste bitter and turn litmus paper blue b.  they have a pH of less than 7 and turn litmus paper red c.  they have a pH of greater than 7 and taste sour d.  they usually feel slippery like soap

Exit Slip 2.  The Bronsted-Lowry definition of a base is a.  a molecule that loses an electron b.  a molecule that has a pH of greater than 7 c.  a molecule that donates hydrogen ions d.  a molecule that accepts hydrogen ions

Exit Slip 3.  In the equation, H2O + HI  H3O+ + I-, which reactant molecule acts as the acid? a.  H2O b.  HI c.  H3O+ d.  I-

Exit Slip 4.  In the equation, H2PO4- + H2O  H3PO4 + OH-, which reactant molecule acts as the base? a.  H3PO4 b.  OH- c.  H2PO4- d.  H2O

Exit Slip 5.  Why could SO42- not act as a Bronsted-Lowry acid? a.  because it can donate O2- ions to solution b.  because it has no H+ ions to donate to solution c.  because it cannot accept any H+ ions d.  because it has a pH of 6

Homework   Finish practice questions

1 22 What Are Strong Acids And Bases

by mrheffner on Jan 25, 2010

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