Experiment20A IntroductiontoAcidsandBases
Ashley Gonzales
Dana Ronquillo
Chem 12/E
January 9, 2015
Experiment 20A - Introduction to Acids and Bases
Purpose:
1. to become familiar with a variety of typical laboratory test for acids and bases
2. to develop operational definitions of acids and bases
3. to develop conceptual definitions of acids and bases
4. to test a variety of household products and classify them as acids or bases
Materials: Refer to “Heath Chemistry- Laboratory Experiments” p.230-231
Procedure: Refer to “Heath Chemistry- Laboratory Experiments” p.230-231
● Change: There should be 5 columns for the Chemical Indicators in the tables.
○ Phenolphthalein
○ Methyl orange
○ Blue litmus
○ Red litmus
○ Red cabbage juice
● Change: There are only 5 unknown solutions (A-E).
Part I and II
● Change: You do not need to collect each chemical in test tubes. For Steps 2-8:
○ “Set up a grid on your ceramic spot plate. Add 1 or 2 drops of phenolphthalein into 1 well. Add 1 or 2 drops of methyl orange to a new well. Add 1 or 2 drops of red cabbage juice to a new well. Tear a small piece of red litmus paper and blue litmus paper and place them in separate wells.”
○ “Obtain a test solution (A-E or one of the household chemicals) and add 1 or 2 drops of the solution into each of the indicator wells. Record your observations in your copy of Table 1 in your notebook.”
○ Add 5-8 drops of the test solution into a test tube. Drop a 0.5 cm piece of magnesium metal into the test tube. Record your observations. (Note: It may take some time.)”
○ “Repeat the three previous steps for each solution (A-E and the household chemicals).” Data and Observations
Unknown Solutions
Unknown
Solutions
Chemical Indicators
Red Cabbage
Juice
Magnesium
Metal
Phenolphthalei n Methyl Orange
Blue Litmus
Red Litmus
A
purple/pink
orange
blue
blue
green
no bubble
B
colourless
red
red
red
red
no bubble
C
colourless
red
red
red
pink
no bubble
D
pink
orange
blue
blue
purple
no bubble
E
colourless
red
red
Dana Ronquillo
Chem 12/E
January 9, 2015
Experiment 20A - Introduction to Acids and Bases
Purpose:
1. to become familiar with a variety of typical laboratory test for acids and bases
2. to develop operational definitions of acids and bases
3. to develop conceptual definitions of acids and bases
4. to test a variety of household products and classify them as acids or bases
Materials: Refer to “Heath Chemistry- Laboratory Experiments” p.230-231
Procedure: Refer to “Heath Chemistry- Laboratory Experiments” p.230-231
● Change: There should be 5 columns for the Chemical Indicators in the tables.
○ Phenolphthalein
○ Methyl orange
○ Blue litmus
○ Red litmus
○ Red cabbage juice
● Change: There are only 5 unknown solutions (A-E).
Part I and II
● Change: You do not need to collect each chemical in test tubes. For Steps 2-8:
○ “Set up a grid on your ceramic spot plate. Add 1 or 2 drops of phenolphthalein into 1 well. Add 1 or 2 drops of methyl orange to a new well. Add 1 or 2 drops of red cabbage juice to a new well. Tear a small piece of red litmus paper and blue litmus paper and place them in separate wells.”
○ “Obtain a test solution (A-E or one of the household chemicals) and add 1 or 2 drops of the solution into each of the indicator wells. Record your observations in your copy of Table 1 in your notebook.”
○ Add 5-8 drops of the test solution into a test tube. Drop a 0.5 cm piece of magnesium metal into the test tube. Record your observations. (Note: It may take some time.)”
○ “Repeat the three previous steps for each solution (A-E and the household chemicals).” Data and Observations
Unknown Solutions
Unknown
Solutions
Chemical Indicators
Red Cabbage
Juice
Magnesium
Metal
Phenolphthalei n Methyl Orange
Blue Litmus
Red Litmus
A
purple/pink
orange
blue
blue
green
no bubble
B
colourless
red
red
red
red
no bubble
C
colourless
red
red
red
pink
no bubble
D
pink
orange
blue
blue
purple
no bubble
E
colourless
red
red