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 |
