A solution with pKa = -7, is
Correct answer: B. Strong acid
- A. Strong base
- B. Strong acid
- C. Neutral
- D. Weak acid
Explanation
The pKa value is an indicator of the strength of an acid. The lower the pKa value, the stronger the acid. A pKa of -7 is extremely low, indicating that the acid is very strong. Strong acids completely dissociate in water, which is consistent with a low or negative pKa value. Conversely, strong bases would be associated with high pKb values, and a neutral solution is not described by pKa. Weak acids have higher pKa values, generally above 0.
Last updated
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.
Practise Acids, Bases and Salts
314 free Acids, Bases and Salts MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
All of the following are postulates of Arrhenius theory of ionization except
Which of the following aqueous solution will be basic?
A start of reaction, concentration of reactants are on
An acid that can act as an oxidizing, dehydrating and acid-producing agent is
Which of the following compounds is the strongest Bronsted acid