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Ответ:
Soluble bases are capable of dissociating or ionizing in water to produce hydroxide ions (OH-) which are responsible for their basic properties. On the other hand, insoluble bases do not dissociate or ionize in water to a significant extent, and therefore do not produce hydroxide ions in solution.
Indicators are substances that exhibit different colors at different pH (acidity or basicity) levels. They are often weak acids or weak bases themselves, and their color changes are due to their ability to gain or lose protons (H+) in response to changes in the pH of the solution.
When a soluble base is added to an acidic solution containing an indicator, it reacts with water to produce hydroxide ions (OH-), which in turn react with the acidic hydrogen ions (H+) from the indicator, causing the indicator to undergo a chemical change and resulting in a color change. The specific color change depends on the indicator used and the pH of the solution.
In contrast, insoluble bases do not produce hydroxide ions in solution, as they do not significantly dissociate or ionize. Therefore, they do not interact with the indicator to cause a color change, and the solution remains unchanged in color.
It's important to note that the solubility of a base can be influenced by various factors such as temperature, pressure, and the presence of other ions in the solution. In some cases, a base that is normally insoluble may become partially soluble and produce enough hydroxide ions to cause a color change in an indicator. However, as a general principle, soluble bases are more likely to cause a color change in indicators compared to insoluble bases due to their ability to produce hydroxide ions in solution
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