| Which
of the solutions gave an acid pH? |
|
| Is
this the result you expected? |
|
| Which
of the solutions was alkaline? |
|
| How
can you relate this result to the use of the liquid? |
|
| Which
of the solutions were neutral? Did you expect these
results? Explain. |
|
Further
Investigation
To answer the following questions you can either try
out the procedure in the laboratory or, using your
knowledge and the information given, make hypotheses
about what might happen. |
Neutralization
If a drop of alkali (pH12) is added to an acid (pH2)
in a test tube you will find that, after mixing the
contents of the test tube, the pH value of the acid
has changed. You might read pH3. If you continue to
add the alkali drop by drop, mixing and testing after
every added drop, you will observe that the pH moves
closer to pH7. If you are lucky you will observe a pH
of 7. This is neutralization. If you are less
fortunate you will find that the pH moves above
pH7. |
| Why
should the pH move above pH7? |
|
| What
would you now do to reach pH7? |
|
Dilution
If you take 1cm3 of a pH2 acid, add 9cm3
of distilled water and mix them well, what would you
expect to happen to the pH of the diluted acid?
Explain your answer. |
|
