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Which statement best describes the equivalence point in a titration between a strong acid and a strong base? (A) The point at which the first sign of a colour change occurs (B) The point at which equal moles of acid and base have been added together (C) The point at which equal moles of H$^+$ ions and OH$^-$ ions have been added together (D) The point at which the rate of the forward reaction equals the rate of the reverse reaction - HSC - SSCE Chemistry - Question 9 - 2006 - Paper 1
Question 9
Which statement best describes the equivalence point in a titration between a strong acid and a strong base? (A) The point at which the first sign of a colour chang... show full transcript
Worked Solution & Example Answer:Which statement best describes the equivalence point in a titration between a strong acid and a strong base? (A) The point at which the first sign of a colour change occurs (B) The point at which equal moles of acid and base have been added together (C) The point at which equal moles of H$^+$ ions and OH$^-$ ions have been added together (D) The point at which the rate of the forward reaction equals the rate of the reverse reaction - HSC - SSCE Chemistry - Question 9 - 2006 - Paper 1
Step 1
The point at which equal moles of H$^+$ ions and OH$^-$ ions have been added together
Answer
In a titration involving a strong acid and a strong base, the equivalence point is defined as the stage where stoichiometrically equivalent amounts of the acid and base have reacted. This occurs when the concentration of hydrogen ions (H) from the acid equals the concentration of hydroxide ions (OH) from the base. At this point, the solution is neutralized, resulting in the formation of water and a salt, confirming that equal numbers of moles of H and OH ions have been present.