The Ka value of HCl is 107 what is its pKa value?
Correct answer: B. -7
- A. 107
- B. -7
- C. 7
- D. Log 7
Explanation
To find the pKa value from the Ka value, use the formula pKa = -log(Ka). Given Ka = 107, the calculation becomes pKa = -log(107) = -7. This is why Option B is correct. Option A incorrectly implies no negative log transformation, Option C suggests a smaller Ka value, and Option D misunderstands the use of logarithms in this context.
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About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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