outsider53 outsider53
  • 23-05-2018
  • Chemistry
contestada

Calculate h3o+ in an aqueous solution that is 0.10M NaNO2 and 0.055M HNO2

Respuesta :

Dejanras
Dejanras Dejanras
  • 02-06-2018
Answer is: concentration of hydronium ions is 8.13·10⁻⁴ M.
c(HNO
₂) = 0.055 M.
c(NaNO
₂) = 0.10 M.
Ka(HNO
₂) = 4.5·10⁻⁴.
This is buffer solution, so use Henderson–Hasselbalch equation: 
pH = pKa + log(c(NaNO
₂) ÷ c(HNO₂)).
pH = -log(4.5·10
⁻⁴) + log(0.055 M ÷ 0.10 M).
pH = 3.35 - 0.26.
pH = 3.09.
[H₃O⁺] = 10∧(-3.09).
[H₃O⁺] = 8.13·10⁻⁴ M.
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