lab 5
Andrexa Peluso
LabReport5.docx
NAME_______________________________ DATE________________
1. Measuring the pH value of some compounds.
|
Solution |
pH by Litmus paper |
pH by Hydrion paper |
pH by pH meter |
Acid, Basic or Neutral |
|
1% NH4OH |
|
|
|
|
|
2% Ethanoic Acid |
|
|
|
|
|
Distilled water |
|
|
|
|
|
1% HCl |
|
|
|
|
|
1% NaOH |
|
|
|
|
2. Buffers.
|
|
pH of water |
pH of buffer solution |
|
Initial |
|
|
|
After five drops NaOH |
|
|
|
After ten drops NaOH |
|
|
Which solution best resists the pH change? Explain your answer.
3. Concentration of Acetic Acid in Vinegar. Sample N0______.
|
Test tube |
Number of NaOH drops |
%(m/v) of acetic acid in vinegar |
|
1 |
|
|
|
2 |
|
|
|
3 |
|
|
|
4 |
|
|
|
Average percentage of acetic acid in vinegar %(m/v) |
|
Questions:
1. What is the difference between a strong acid and a weak acid? Explain and use examples of each type of acid.
2. Give examples of:
a- An Acid Buffer (two components).
b- A Basic Buffer (two components).
3. Complete the table given bellow:
|
[H3O+1] |
[OH-1] |
pH |
Acidic, basic or neutral |
|
1.0 x 10-3 |
|
|
|
|
|
|
5 |
|
|
|
3.0 x 10-6 |
|
|
|
|
|
|
neutral |
