Reference no: EM13775518
Please note here if BTB or any of the other starting materials is other than a clear, colorless solution:
Table 1
In columns 2 and 3 record the color and intensity you see.
|
Well #
|
Substance
|
1Drop
BTB
|
Add 1 Drop
of Substance
|
Acid or Base?
|
Ionic?
Y/N
|
Species Acting as Acid or Base
|
|
1
|
NaHCO3
|
|
|
|
Y
|
HCO3-
|
|
2
|
CH3COOH
|
|
|
|
|
|
|
3
|
HCL
|
|
|
|
|
|
|
4
|
Na2CO3
|
|
|
|
|
|
|
5
|
H2SO4
|
|
|
|
|
|
|
6
|
CH3COONa
|
|
|
|
|
|
|
7
|
NaOH
|
|
|
|
|
|
|
8
|
HNO3
|
|
|
|
|
|
|
9
|
NaHSO4
|
|
|
|
|
|
|
10
|
NH3
|
|
|
|
|
|
|
11
|
H3PO4
|
|
|
|
|
|
|
12
|
NaH2PO4
|
|
|
|
|
|
|
13
|
Na2HPO4
|
|
|
|
|
|
|
14
|
Na3PO4
|
|
|
|
|
|
|
15
|
NaHSO3
|
|
|
|
|
|
Table 2: Following Acid/Base neutralization reactions
Please note here if BPB or any of the other starting materials is other than a clear, colorless solution:
|
Well #
|
1 Drop of Each
|
Observation
|
+2 Drops Acid
|
Observation
|
+2 Drops Base
|
Observation
|
|
1
|
BPB + NaOH
|
|
HCl
|
|
NaOH
|
|
|
2
|
BPB + NaOH
|
|
H2SO4
|
|
NaOH
|
|
|
3
|
BPB + NaOH
|
|
CH3COOH
|
|
NaOH
|
|
|
4
|
BPB + NaOH
|
|
H3PO4
|
|
NaOH
|
|
|
5
|
BPB + Ca(OH)2
|
|
HCl
|
|
Ca(OH)2
|
|
|
6
|
BPB + Ca(OH)2
|
|
H2SO4
|
|
Ca(OH)2
|
|
|
7
|
BPB + Ca(OH)2
|
|
CH3COOH
|
|
Ca(OH)2
|
|
|
8
|
BPB + Ca(OH)2
|
|
H3PO4
|
|
Ca(OH)2
|
|
|
9
|
BPB + NH3
|
|
HCl
|
|
NH3
|
|
|
10
|
BPB + NH3
|
|
H2SO4
|
|
NH3
|
|
|
11
|
BPB + NH3
|
|
CH3COOH
|
|
NH3
|
|
|
12
|
BPB + NH3
|
|
H3PO4
|
|
NH3
|
|
Data Table 3: Investigating Odor as a Means of Indicating Neutralization.
|
Substance(s)
|
Odor
|
|
2 Drops of HCl in Well #1
|
|
|
1 Drop of Ammonia on Swab
|
|
|
Swab with Ammonia & HCl
|
|
Data Table 4:Investigating Evaporation as a Means of Indicating a Neutralization Reaction.
|
Reaction Mixture
|
Observation (When Wet)
|
Observation (When Dry)
|
|
HCl + NaOH
|
|
|
|
CH3COOH + NH3
|
|
|
|
HNO3 + NaOH
|
|
|
1. Use BTB to classify four household products as acidic or basic. Possible substances to test include home cleaning products, glass cleaner, liquid detergent, bleach, soft drinks, liquid from food items, etc. Remember to:
- State a hypothesis or purpose.
- State the testing method.
- Organize data in a concise table.
- Read the label for each product, and list in the data table what may be the acid or base in the product.
- State conclusions in terms of the hypothesis or purpose.
2. Find one common, highly colored substance that can be used as an acid-base indicator. Possible substances include fruit/vegetable juice or products, inks, food coloring, flower petals, etc. If using fresh fruit, veggies, or flowers, crush the substance with a little water or rubbing alcohol to extract the colored pigments. If red cabbage is available, it makes a superb acid-base indicator. Then use a few drops of the colored extract as the indicator. Test four more household products using the freshly made acid-base indicator. Remember to:
- State a hypothesis or purpose.
- State the testing method.
- Use the prepared indicator to test four substances known to be acids or bases from either the LabPaq or home materials and record results.
- State conclusions in terms of the hypothesis or purpose.
What is produced in each and every reaction of an acid with water and what is produced in each and every reaction of a base with water?
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