LAB REPORT No 5
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
