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A 0.1 mol L⁻¹ solution of hydrochloric acid has a pH of 1.0, whereas a 0.1 mol L⁻¹ solution of citric acid has a pH of 1.6 - HSC - SSCE Chemistry - Question 20 - 2001 - Paper 1
Question 20
A 0.1 mol L⁻¹ solution of hydrochloric acid has a pH of 1.0, whereas a 0.1 mol L⁻¹ solution of citric acid has a pH of 1.6. (a) State ONE way in which pH can be mea... show full transcript
Worked Solution & Example Answer:A 0.1 mol L⁻¹ solution of hydrochloric acid has a pH of 1.0, whereas a 0.1 mol L⁻¹ solution of citric acid has a pH of 1.6 - HSC - SSCE Chemistry - Question 20 - 2001 - Paper 1
Step 1
Step 2
Explain why the two solutions have different pH values.
Answer
The two solutions have different pH values due to the nature and strength of the acids involved. Hydrochloric acid (HCl) is a strong acid and dissociates completely in solution, generating a higher concentration of hydrogen ions (H⁺) and thus a lower pH. In contrast, citric acid is a weak acid that does not dissociate completely, resulting in fewer hydrogen ions in solution and a higher pH value. Additionally, factors such as the presence of buffering agents and the concentration of the acid can also affect the overall pH.