Chemistry Titration Virtual Lab

Chemistry Titration Virtual Lab

Activity 1: CURVES. http://www.mhhe.com/physsci/chemistry/animations/chang_7e_esp/crm3s5_5.swf.

Try the simulation and create the full graph.

1. As you do the titration, take a look at the particulate view. What do you notice happening as you add NaOH? What is the difference in the beginning and the end picture, show your calculation for the right answers here?

Activity 2: SALTS.

http://www.chem.iastate.edu/group/Greenbowe/sections/projectfolder/flashfiles/acidbasepH/ph_meter.html

SET ALL VALUES TO 0.100M for all salts (enter THE NUMBER 10 IN THE BOX) and put probeinto the solution.

Find the pH of ALL the salts listed and then calculate their pH ‘s from you Ka tables to compare,

For this lab, you will compare the pH at various points during the titration of a strong acid vs. strong base to the pH at the same points during the titration of a weak acid vs. strong base. You need to do the calculations.

Activity 3.TITRATION

Select "Strong Acid vs. Strong Base". Click fill the buret with Base. Select HClas the acid and NaOH as the base. Select an indicator. The computer will automatically assign you a molarity for the acid and a volume for the acid.

http://www.chem.iastate.edu/group/Greenbowe/sections/projectfolder/flashfiles/stoichiometry/acid_base.html

A.Calculate the pH of the acid before any base is added

B.Add 10.0 mL of the NaOH. Write an equation between HClreacts with NaOH.

C.Calculate the pH of the resultant solution, when you add 10.0 mL of the KOH. You will need to titrate to the end point in order to determine the molarity of the base (see D).

D. Titrate to the end point, calculate the molarity of the base, enter this number and click-on "OK". Then, go back and do part "C".

Activity 2.GOTO the computer simulation and select "Reset". Select "Weak Acid vs. Strong Base". Click fill the buret with Base. Select CH3COOH as the weak acid and NaOH as the base. Select an indicator. The computer will automatically assign you a molarity for the acid and a volume for the acid.

F.Calculate the pH of the weak acid before any base is added.

G.Add 10.0 mL of the NaOH. Write a chemical equation for CH3COOHreacts with NaOH.

H.Calculate the pH of the resultant solution, when you add 10.0 mL of the NaOH. You will need to titrate to the end point in order to determine the molarity of the base (see I). Also write an equation that illustrates what the equation is for the solution at this point in the titration.

I.Titrate to the end point, calculate the molarity of the base, enter this number and click-on "OK". Calculate the pH at the equivalence point. Then, go back and do part "H".