IB Chemistry R3.1.16 Buffer Solutions Notes

Buffers: Definition, Components, and pH Calculation

Definition

Buffers

Buffers are solutions that resist changes in pH when small amounts of acid ($H⁺$ ions) or base ($OH⁻$ ions) are added.

Example

They play a critical role in maintaining pH stability in chemical reactions, biological systems (like blood), and industrial processes.

To understand how buffers work, consider this:

If you add a strong acid to pure water, the pH drops significantly because there’s nothing in the water to counteract the influx of $H⁺$ ions.

A buffer, however, "absorbs" most of these $H⁺$ ions, minimizing the pH change.

Analogy

Think of a buffer as a sponge.
Just as a sponge absorbs water to prevent spills, a buffer absorbs excess $H⁺$ or $OH⁻$ ions, preventing drastic pH changes.

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IB Chemistry R3.1.16 Buffer Solutions Notes

IB Chemistry R3.1.16 Buffer Solutions Notes

Buffers: Definition, Components, and pH Calculation

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Buffers: Definition, Components, and pH Calculation

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IB Chemistry R3.1.16 Buffer Solutions Notes

Structure 1. Models of the particulate nature of matter5 subtopics

Structure 2. Models of bonding and structure4 subtopics

Structure 3. Classification of matter2 subtopics

Reactivity 1. What drives chemical reactions?4 subtopics

Reactivity 2. How much, how fast and how far?3 subtopics

Reactivity 3. What are the mechanisms of chemical change?4 subtopics

IB Chemistry R3.1.16 Buffer Solutions Notes

Structure 1. Models of the particulate nature of matter5 subtopics

Structure 2. Models of bonding and structure4 subtopics

Structure 3. Classification of matter2 subtopics

Reactivity 1. What drives chemical reactions?4 subtopics

Reactivity 2. How much, how fast and how far?3 subtopics

Reactivity 3. What are the mechanisms of chemical change?4 subtopics

Buffers: Definition, Components, and pH Calculation

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Buffers: Definition, Components, and pH Calculation

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