Ka<10-3 means______________?
Correct answer: B. Very weak acid
- A. Very strong base
- B. Very weak acid
- C. Very strong acid
- D. Very strong salt
Explanation
A small Ka indicates that an acid ionises only slightly in water, so Ka less than 10^-3 is intended here to indicate a weak acid. A very strong acid would have a much larger Ka and would ionise nearly completely. The likely mistake is choosing very strong acid because a numerical value is being compared without remembering that smaller Ka means weaker acid.
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About Buffer Solutions
Buffer solutions resist changes in pH when small amounts of acid or base are added, using a weak acid and its conjugate base or a weak base and its conjugate acid. Work includes buffer action, the common-ion effect, Henderson-Hasselbalch calculations, buffer capacity, and the difference between acidic and basic buffers.
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