Chemistry Unit 3 Lab
(4 points: 2 points each for each bullet-point below)
Score
List the actual volume of titrant needed to produce a color change for Sample A and
Sample B.

Volume of titcent needed to produce a color change for Sample A: _ml
Volume of titcent needed to produce a color change for Sample B: __ml
(8 points; 2 points each for each bullet-point below)
Score
There are many aspects to the technique known as titration that are extremely important if
results are to be accurate. In a traditional or authentic laboratory setting, these techniques
are important and sometimes delicate. List two of the techniques used in this lab that
provided you will the most accurate possible results. Describe why these techniques are
important and how ignoring the techniques would affect the lab.

Technique #1: ...
Why technique is important: ...
Technique #2:
Why technique #2 is important: ...
(4 points; 2 points for naming the correct lake, 2 points for your explanation)
Score
The titration procedure you have just performed is similar to what is carried out by water-
quality workers throughout the world. They use a kit to perform titration on location instead of
in a laboratory. In real-life situations, workers collect water samples in a lake or stream. In
lakes and streams calcium carbonate (CaCO3) causes alkalinity. Calcium carbonate acts as
a buffer, a substance that serves to resist small changes in acidity or alkalinity in a solution
When acid rain enters lake water, it can be neutralized by the bases present and thus the
lake does not become too acidic, Since the key ion is the hydroxide ion, the nature of the
natin dan't matter in this case. All over the world, right now, pollution workers are