Acid/Base Worksheet #1

NAME

ACID/BASE WORKSHEET

Properties of Acids and Bases

WEB APPLICATIONS

Research online and write the pH of each of the following acids and bases.

CHEMISTRY IN CONTEXT NAME

ACID/BASE WORKSHEET, PAGE 3

NOVEMBER 14, 2006

PART C -- INTERACTIVE LAB

DIRECTIONS: A titration is an experiment where an acid and base are mixed and

their pH is studied as they react with one another.

1) Access the web site below and SCROLL DOWN to the

Acid-Base Titration Lab box.

2) Type your name and click NEXT.

3) As you proceed, ONLY CHANGE SELECTIONS WHEN

DIRECTED by this handout.

4) Answer the questions below with SHORT ANSWERS as you

get to each step and click NEXT to go to the next step.

http://lrs.ed.uiuc.edu/students/mihyewon/chemlab_experiment.html

Step 1 :: What acid are you using?

How much?

Step 2 :: What base are you using?

How much?

Step 3 :: Select a color indicator that you would like to use.

Step 4 :: Record the initial pH of the flask.

Record the initial color of your flask.

Move the speed bar to 1/2 way between slow and fast and WATCH and

WAIT for the titration to end.

At what pH does the color start changing?

Record the final pH of the flask.

Record the final color of the flask.

CHEMISTRY IN CONTEXT NAME

ACID/BASE WORKSHEET, PAGE 4

NOVEMBER 14, 2006

Step 5 :: Sketch a picture of your titration curve below:

STOP after Step 5 and answer the following questions:

1) Why do you think we use indicators that change colors when working with acids

and bases?

2) According to your graph, how much base did it take to neutralize your acid?

(i.e. make it a pH of 7) Look back Step 1 to see how much acid you started with.

Now, which of your substances was stronger?

PART D – PRACTICE QUIZ

DIRECTIONS: Take the online quiz at the following link as PRACTICE. Record

your score AND ALSO write into your notes ANY ITEMS from the

quiz that you DID NOT KNOW.

http://www.chem4kids.com/extras/quiz_reactacidbase/index.html