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A. 7.2
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B. 2.9
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C. None of these
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D. 4.5
Explanation
- Pyruvic acid (CH₃COCOOH) is a weak acid with a pKa of around 2.5,
- This meaning it partially ionizes in water.
- Using the Henderson-Hasselbalch equation, the pH of a 0.1M solution of pyruvic acid is approximately 4.5.
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A. 8
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B. 10
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C. None of these
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D. 4
Explanation
- For a strong acid with a high Ka value (10.8), it fully ionizes in water.
- pH is calculated as , and for a 1 M strong acid, , so pH = 4.
تیزابیت کے بعد جو ڈھانچہ باقی رہتا ہے وہ پروٹون کو ____ کہتے ہیں؟
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A. Conjugate base
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B. None of these
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C. Conjugate acid
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D. Conjugate salt
Explanation
- When an acid donates a proton (), the remaining species is called its conjugate base.
- For example, HCl (acid) gives up to form Cl⁻ (conjugate base).
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A. N2
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B. HBr
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C. HCl
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D. O2
Explanation
Among the halogen acids (HF, HCl, HBr, and HI), HI (hydroiodic acid) is the strongest.
The strength of an acid is determined by the ease with which it can donate a hydrogen ion (H+).
The H-I bond is the weakest of the halogen acid bonds, allowing HI to readily dissociate in water and release H+ ions.
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