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PH concepts and ionisation constants Video Lecture - Chemistry Class 11
FAQs on PH concepts and ionisation constants
| 1. What is the pH scale and how is it measured? |  |
Ans. The pH scale is a logarithmic scale that measures the acidity or alkalinity of a solution. It ranges from 0 to 14, where a pH of 7 is considered neutral, below 7 indicates acidity, and above 7 indicates alkalinity. The pH is measured using pH indicators, pH meters, or litmus paper, which change colour based on the acidity or alkalinity of the solution.
| 2. What does it mean when a substance has a low ionisation constant? | |
Ans. A low ionisation constant (K) indicates that a substance is a weak acid or base, meaning it does not ionise completely in solution. This results in a lower concentration of hydrogen ions (H⁺) in the case of acids, or hydroxide ions (OH⁻) for bases, leading to a higher pH value for weak acids and a lower pH value for weak bases compared to strong acids and bases.
| 3. How does temperature affect the pH of a solution? | |
Ans. Temperature can significantly affect the pH of a solution. As temperature increases, the ionisation of water also increases, which can lead to a decrease in pH. This means that at higher temperatures, pure water may have a pH lower than 7, indicating a more acidic environment. Conversely, cooling a solution can increase its pH.
| 4. What are the common methods for calculating ionisation constants? | |
Ans. Ionisation constants can be calculated using the formula K = [H⁺][A⁻] / [HA] for acids, where [H⁺] is the concentration of hydrogen ions, [A⁻] is the concentration of the conjugate base, and [HA] is the concentration of the undissociated acid. For bases, a similar formula is used. Experimental methods such as titrations and spectrophotometry can also provide data for calculating these constants.
| 5. Why is understanding pH and ionisation constants important in chemistry? | |
Ans. Understanding pH and ionisation constants is crucial in chemistry as they influence reaction rates, solubility, and the behaviour of compounds in chemical reactions. This knowledge is essential for applications in fields such as biochemistry, environmental science, and pharmaceuticals, where the pH can affect enzyme activity, nutrient availability, and drug formulation.
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Apr 19, 2026 Last updated
Video Description: PH concepts and ionisation constants for NEET 2026 is part of Chemistry Class 11 preparation. The notes and questions for PH concepts and ionisation constants have been prepared according to the NEET exam syllabus. Information about PH concepts and ionisation constants covers all important topics for NEET 2026 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for PH concepts and ionisation constants.
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