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Anettt [7]
3 years ago
15

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

Chemistry
1 answer:
SSSSS [86.1K]3 years ago
3 0
Answer is: concentration of hydronium ions is 8.13·10⁻⁴ M.<span>
c(HNO</span>₂) = 0.055 M.<span>
c(NaNO</span>₂) = 0.10 M.<span>
Ka(HNO</span>₂) = 4.5·10⁻⁴.<span>
This is buffer solution, so use Henderson–Hasselbalch equation: 
pH = pKa + log(c(NaNO</span>₂) ÷ c(HNO₂)).<span>
pH = -log(4.5·10</span>⁻⁴) + log(0.055 M ÷ 0.10 M).<span>
pH = 3.35 - 0.26.
pH = 3.09.
</span>[H₃O⁺<span>] = 10</span>∧(-3.09).
[H₃O⁺] = 8.13·10⁻⁴ M.
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