Does Adding HCl Change the pH of a CH3COOH/CH3COO Buffer?

In summary, a buffer is a solution used in scientific research to maintain a constant pH level and create a stable environment for chemical reactions. It works by absorbing or releasing hydrogen ions and can be designed to work within different pH ranges. The effectiveness of a buffer can be tested by measuring pH levels or using a buffer capacity assay.
  • #1
Boxxxed
2
0
Calculate final pH of 25 ml buffer 0.1 M CH3COOH/CH3COO, pH=3.50, after the addition of 1.00 ml of 0.1 M HCl.


3.50=4.75+log(base/3.16x10-4)

Base = 1.78x10-5 M
Acid = 3.16x10-4 M


Mole base = 0.000712 - 0.0001 = 0.000612
Mole Acid = 0.01264 +0.0001 = 0.01274

Mole Acid added = 0.0001 Mole

ph=4.75+log(0.000612/0.01274)

ph = 2.43

Is this correct?
 
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  • #2
Boxxxed said:
Base = 1.78x10-5 M
Acid = 3.16x10-4 M

Total of 3.33x10-4M, that's not a 0.1M buffer.
 

FAQ: Does Adding HCl Change the pH of a CH3COOH/CH3COO Buffer?

1. What is a buffer?

A buffer is a solution that helps to maintain a constant pH level by resisting changes in acidity or alkalinity. It is typically composed of a weak acid and its conjugate base, or a weak base and its conjugate acid.

2. Why are buffers important in scientific research?

Buffers are important in scientific research because they help to maintain a stable environment for chemical reactions to occur. This is especially important in biological systems, where even slight changes in pH can have significant impacts on cellular function.

3. How do buffers work?

Buffers work by absorbing or releasing hydrogen ions (H+) in order to maintain a stable pH level. This is achieved through the equilibrium between the weak acid and its conjugate base, or the weak base and its conjugate acid.

4. Can buffers be used in different pH ranges?

Yes, buffers can be designed to work within different pH ranges by selecting a weak acid and its conjugate base, or a weak base and its conjugate acid, with appropriate dissociation constants. This allows for the use of buffers in a wide range of scientific experiments.

5. How do I know if my buffer is working correctly?

The effectiveness of a buffer can be determined by measuring the pH of the solution before and after the addition of an acid or base. If the pH remains relatively stable, the buffer is working correctly. Additionally, buffers can be tested using a buffer capacity assay to determine the amount of acid or base that can be added before a significant change in pH occurs.

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