Lab Report 5 - Measuring the pH value of some compounds

LAB REPORT No 5

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