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In a buffer solution, which component resists changes in pH? (2020)

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Question: In a buffer solution, which component resists changes in pH? (2020)

Options:

  1. Strong acid
  2. Weak acid and its salt
  3. Strong base
  4. Water

Correct Answer: Weak acid and its salt

Exam Year: 2020

Solution: 

A buffer solution typically consists of a weak acid and its conjugate base (salt), which helps to resist changes in pH when small amounts of acid or base are added.

In a buffer solution, which component resists changes in pH? (2020)

Practice Questions

Q1
In a buffer solution, which component resists changes in pH? (2020)
  1. Strong acid
  2. Weak acid and its salt
  3. Strong base
  4. Water

Questions & Step-by-Step Solutions

In a buffer solution, which component resists changes in pH? (2020)
  • Step 1: Understand what a buffer solution is. A buffer solution is a special type of solution that can maintain a stable pH level.
  • Step 2: Learn about the components of a buffer solution. It usually contains a weak acid and its conjugate base (which is often a salt).
  • Step 3: Know the role of the weak acid. The weak acid can donate protons (H+) when a base is added, helping to prevent an increase in pH.
  • Step 4: Understand the role of the conjugate base. The conjugate base can accept protons (H+) when an acid is added, helping to prevent a decrease in pH.
  • Step 5: Conclude that both the weak acid and its conjugate base work together to resist changes in pH when small amounts of acid or base are added.
  • Buffer Solution – A buffer solution is a mixture of a weak acid and its conjugate base that maintains a relatively stable pH when small amounts of acid or base are added.
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