By the addition of base in waterpH will be_______________?
Correct answer: A. more than 7
- A. more than 7
- B. less than 7
- C. equal to 7
- D. no effect
Explanation
Adding a base increases the concentration of OH- ions and lowers the concentration of H+ ions, so pH rises above 7 in ordinary aqueous conditions. It may not become exactly neutral or remain unchanged. Students often choose equal to 7 because they assume acid-base addition always produces neutralization, but no acid is stated here to neutralize the added base.
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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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