Tuesday and Wednesday April 29-30 2014
What we did in class (29th):
- Today in class we finished the indicator lab
- We went over the things that were due on THURSDAY for the lab
- Mrs. Friedman showed us an example problem that would have to do with the homework
What is due for the Lab:
- The Lab is due THURSDAY
- You need a typed data table, it's not required that the calculated pH's be on the type table
- You also need a sheet with all of the calculations required
- You need to do calculations for the following:
- .001 M HCl
- .001 M NaOH
- .001 M Acetic Acid
- .001 NH4OH
- .1 M NaCl
- .1 M Na3PO4
Other Homework:
- The last two sheets of the packet on Acids and Bases
- This includes the two ICE Table questions on Buffers (which are done exactly the same way as common-ion problems) and the last sheet which is a general practice of ICE Tables
- These sheets are due WEDNESDAY
What we did in class (30th):
- We went over the last two sheets of the acids and bases packet
- Mrs. Friedman's computer crashed (condolences)
- We took notes on Neutralization Reactions and Titrations
Acid + Base ---> Salt + Water
Ex. HCl + NaOH ---> NaCl + H2O
For every mole of H+ or H3O there should be one mole of OH to neutralize it = Titration
When you know the concentration of a base, you can find the concentration of the acid using Titration
Equivalence Point: When moles of H+ = moles of OH- = pH of 7
End Point: When the indicator is at it's faintest color possible
Overshoot: When the indicator color is too strong, you passed the end point
Calculation for Concentrations:
# of H's in the formula x Molarity of Acid x Volume of Acid = Molarity of Base x Volume of Base x # of OH-'s in the formula
Homework due Thursday:
- The lab as mentioned above
- Two practice problems that are on one of the lab sheets we received today
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