Combining Solutions of Ionic Compounds
Materials: -4x6 spot plate
-Masking tape
-Solutions A,B,C, and
D (some are corrosive)
-4 Pieces of Mg ribbon
-4 Pieces of red
litmus paper
-4 Pieces of blue
litmus paper
-Bromothymol blue
solution
-Indigo carmine
solution
-Methyl orange
solution
Procedure: The
procedure used was from the BC Science 10 textbook on page 230
Results:
Mg Ribbon
|
Red Litmus
|
Blue Ribbon
|
Bromothymol
Blue
|
Indigo Carmine
|
Methyl Orange
|
Unknown
|
Began to bubble
somewhat quickly, bubbles formed on the bottom.
|
Red paper, but the
solution looks blue
|
Nothing
|
The solution turned
yellow
|
The solution turned
blue
|
The solution turned
red
|
A
|
Nothing
|
The paper was blue
|
Nothing
|
The solution turned
royal blue
|
The solution turned
dark green
|
The solution turned
yellow orange
|
B
|
A few small bubbles
|
The paper was red
|
Nothing
|
The solution turned
green
|
The solution turned
blue
|
The solution turned
yellow orange
|
C
|
A few small bubbles
|
The paper was blue
|
Nothing
|
The solution turned light
blue
|
The solution turned blue
|
The solution turned
yellow orange
|
D
|
Discussion
Analyze:
From most
acidic to most basic I think is A,C,B,D.
I am not certain as I really am not confident with my results. Even with
this, I believe that the neutral solution was C. I believe that the most alkaline solution was
solution B. My reasoning is that it was the only solution to not react at all
with the Mg ribbon and it reacted with the liquid indicators as well. The
ribbon was useful for testing the pH as acids would react with it to produce a
salt and hydrogen gas. The gas then was able to bubble in the solution.
Conclude
and Apply:
If there
was a pH of 3 in a solution, the indicators would be red. If there was a pH of
10, the indicators would be blue. If I needed 3 tests to see if a sample was
acidic, neutral, or basic, I would use red Litmus paper, blue litmus paper, and
an alkaline earth metal. My reasoning is pretty obvious for the litmus paper as
it would give a pretty instant reading. The metal would be good confirmation if
the sample was acidic as it would react. For the colour of the Roccella
tincoria being dipped in vinegar, my educated guess would be that it turns red.
This is because vinegar is acidic. To find out the colour of seawater with
Bromothymol blue added to it, I needed to find out the pH of seawater. I learned
that is a little bit basic. And when Bromothymol blue reacts with bases, you
get a dark blue colour.
Conclusion
This experiment
was interesting. I think that the results we got however were off. They were
different than the other group we worked with. However, we were able to clearly
identify the acid thanks to the liquid indicators, litmus, and the
magnesium. Another problem we had was
the beakers with solution were not properly labelled, so we weren’t 100% sure
which solutions were A,B,C, and D.
