Respuesta :
Answer:
This solution has a pH of 11.20
Explanation:
HNO3 is a strong acid known to ionize completely in solution. Being a strong acid, a low pH value is expected. As expected, an acid will display the following properties:
This solution could dissolve metal.
This solution could neutralize a base.
This solution would turn litmus to red.
The pH of this solution is obtained from -log[H+]
pH = -log(1.6 × 10-3)= 2.796
Hence the statement; This solution has a pH of 11.20 is not correct.
Regarding a 1.6 × 10⁻³ M solution of HNO₃, it is not true that this solution has a pH of 11.20.
Consider a 1.6 × 10⁻³ M solution of HNO₃. Which of the following statements is NOT true?
- This solution could dissolve metal. TRUE. Nitric acid can dissolve most metals.
- This solution could neutralize a base. TRUE. HNO₃ is an acid so it neutralizes bases.
- This solution would turn litmus to red. TRUE. Litmus, in presence of acids, turns red.
- This solution has a pH of 11.20. FALSE.
HNO₃ is a strong acid so that [H⁺] = 1.6 × 10⁻³ M. The pH is:
[tex]pH = -log 1.6 \times 10^{-3} = 2.8[/tex]
The pH < 7, as expected for an acid.
Regarding a 1.6 × 10⁻³ M solution of HNO₃, it is not true that this solution has a pH of 11.20.
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