Which of the following solution have highest pH?
Correct answer: A. 0.2 M Ca(OH)2
- A. 0.2 M Ca(OH)2
- B. 0.1 M Na(OH)
- C. 0.1 M HCl
- D. 0.1 M CH3COOH
Explanation
The solution with the highest pH is the one that is most basic. Calcium hydroxide, Ca(OH)2, is a strong base and at 0.2 M concentration, it provides a significantly higher concentration of hydroxide ions compared to 0.1 M NaOH, which is also a strong base but at a lower concentration. Both HCl and CH3COOH are acids, with HCl being a strong acid resulting in a very low pH, and CH3COOH being a weak acid resulting in a higher pH than HCl but still much lower than that of the strong bases. Therefore, 0.2 M Ca(OH)2 has the highest pH among the given options.
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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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