⑶ 40.0 mL 的 0.1250 M NH₃ 與 20.0 mL 的 0.100 M HCl 混合溶液 K_a(NH⁴⁺) = 5.7 × 10^-10

⑵礦泉水中含的 CaCO3濃度（ppm）。

⑶礦泉水中含的 MgCO3濃度（ppm）。 （註：原子量 Mg = 24.3, Ca = 40.1, C = 12.00, O = 16.00）

⑴ 0.0400 M Na3PO4, Ka3(H3PO4) = 4.5 × 10-13

⑵ 0.0400 M Na2C2O4 Ka2(H2C2O4) = 5.42 × 10-5

⑷ 0.0240 M H2C2O4（oxalic acid）及 0.0360 M Na2C2O4混合溶液

⑸ 0.0400 M C2H4(NH3+ Cl- )2 Ka1(NH3C2H4NH3+2) = 1.42 × 10-7

⑴計算氫氧化鋇莫爾濃度。

⑵如果重量與體積的標準偏差分別為±0.3mg 及±0.02 mL，計算莫爾濃度 的標準偏差並以有效數字表示氫氧化鋇莫爾濃度及標準偏差。

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