Photo AI
Equal volumes of four 0.1 mol L⁻¹ acids were titrated with the same sodium hydroxide solution - HSC - SSCE Chemistry - Question 7 - 2010 - Paper 1
Question 7
Equal volumes of four 0.1 mol L⁻¹ acids were titrated with the same sodium hydroxide solution. Which requires the greatest volume of base to change the colour of th... show full transcript
Worked Solution & Example Answer:Equal volumes of four 0.1 mol L⁻¹ acids were titrated with the same sodium hydroxide solution - HSC - SSCE Chemistry - Question 7 - 2010 - Paper 1
Step 1
Which requires the greatest volume of base to change the colour of the indicator?
Answer
To determine which acid requires the greatest volume of sodium hydroxide (NaOH) for titration, we need to consider the strength and dissociation of each acid.
- Citric Acid: This is a triprotic acid (can donate three protons), thus it will require more base to completely neutralize.
- Acetic Acid: This is a weak monoprotic acid, which means it only donates one proton and thus would require less base than a triprotic acid.
- Sulfuric Acid: This is a strong diprotic acid (can donate two protons), will need more NaOH compared to acetic acid, but less than citric acid.
- Hydrochloric Acid: This is a strong monoprotic acid, and while it will also require less NaOH than triprotic acids, it is strong and completely dissociates.
Based on these considerations, the acid that requires the greatest volume of NaOH to change the indicator's color is Citric Acid (A) due to its triprotic nature.