Chemistry的問題（關於mole數）?

monobasic acid 又稱為 monoprotic acid，是指每個 acid molecule 只含有個可 ionize 成 hydrogen ion 的H atom。

acid 的 molecular formula 可寫成 HnA。其 ionization 的 equation 是：
HnA(aq) → nH^+(aq) + A^(n-)(aq)
或 HnA(aq) ⇌ nH^+(aq) + A^(n-)(aq)

當 n = 1 時，則該 acid 是 monobasic acid。其 molecular formula 可寫成 HA。而其 ionization 的 equation 是：
HA(aq) → H^+(aq) + A^-(aq)
或 HA(aq) ⇌ H^+(aq) + A^-(aq)

常見 monobasic acid 的例子包括 HCl、HNO3、CH3COOH。


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1 g of monobasic acid of unknown formula is dissolved in 20.72cm3 of 0.588M KOH solution.

Let HA be the formula of the monobasic acid.

HA + KOH → KA + H2O
Mole ratio HA : KOH = 1 : 1

No. of moles of KOH = (0.588 mol/dm³) × (20.72/1000 dm³) = 0.0122 mol
No. of moles of HA = 0.0122mol
Molar mass of HA = (1 g) / (0.0122 mol) = 82.0 g/mol ...... (Ans)
Relative molecular mass of HA = 82.0 ...... (Ans)