Referring to Table 17.1, pick an indicator for use in the titration of each base with a strong acid. a. CH₃NH₂

검증된 단계별 안내

Identify the pH range of the equivalence point for the titration of CH3NH2 (a weak base) with a strong acid.

Determine the expected pH at the equivalence point. For a weak base titrated with a strong acid, the equivalence point will be in the acidic range (pH < 7).

Refer to the provided table to find an indicator that changes color in the acidic pH range.

Select an indicator whose color change range includes the expected pH at the equivalence point.

Verify that the chosen indicator's color change range is appropriate for the titration of CH3NH2 with a strong acid.

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주요 개념

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Acid-Base Titration

Acid-base titration is a quantitative analytical method used to determine the concentration of an acid or base in a solution. In this process, a solution of known concentration (the titrant) is gradually added to a solution of unknown concentration until the reaction reaches its equivalence point, indicated by a color change due to an indicator. This technique is fundamental in chemistry for analyzing the strength and concentration of acids and bases.

Indicators

Indicators are substances that change color at a specific pH range, making them useful for determining the endpoint of a titration. Different indicators have different pH transition ranges, which means they are suitable for different types of titrations. For example, phenolphthalein changes from colorless to pink around pH 8.2 to 10, making it ideal for strong acid-weak base titrations, while methyl red changes from red to yellow between pH 4.4 and 6.2.

pH Scale

The pH scale is a logarithmic scale used to specify the acidity or basicity of an aqueous solution, ranging from 0 (very acidic) to 14 (very basic), with 7 being neutral. The pH of a solution affects the behavior of acids, bases, and indicators during titration. Understanding the pH scale is crucial for selecting the appropriate indicator for a titration, as the indicator must change color at a pH that corresponds to the expected equivalence point of the reaction.

Referring to Table 17.1, pick an indicator for use in the titration of each base with a strong acid. a. CH3NH2