✔ 最佳答案
1.
NaOH 的莫耳數 = 0.225/(23 + 16 + 1) = 0.005625 mol
[NaOH] = 0.005625 / 0.205 = 0.0274 M
[OH⁻] = 0.0274 M
2.
HCl 的莫耳數 = 2.5/(1+ 35.5) = 2.5/36.5 mol
[HCl] = (2.5/36.5) / (425/1000) = 0.161 M
[H⁺] = 0.161 M
pH = -log(0.161) = 0.79
3.
A.
HCl + NaOH → NaCl + H2O
HCl 的莫耳數 = 0.228 x (25/1000) = 0.0057 mol
NaOH 的莫耳數 = 0.0057 mol
所需 NaOH 的體積 = 0.0057/0.150 = 0.038 L = 38.0 mL
B.
H2SO4 + 2NaOH → Na2SO4+ 2H2O
H2SO4 的莫耳數 = 0.560 x (10.0/1000) =0.00560 mol
NaOH 的莫耳數 = 0.00560 x 2 = 0.0112 mol
NaOH 的體積 = 0.0112/0.150 = 0.0746 L = 74.7 mL
4.
NaCl 不可將 H2SO4中和。
若 NaCl 為 NaOH 之誤,則答案如下:
H2SO4 + 2NaOH → Na2SO4+ 2H2O
H2SO4 的莫耳數 = 0.825 x (2.50/1000) =0.0020625 mol
NaOH 的莫耳數 = 0.0020625 x 2 = 0.004125 mol
NaOH 的體積 = 0.004125/0.215 = 0.0192 L = 19.2 mL
5.
CH3COOH + NaOH → CH3COOH + H2O
NaOH 的莫耳數 = 0.500 x (16.5/1000) = 0.00825 mol
CH3COOH 的莫耳數 = 0.00825 mol
CH3COOH 的體積莫耳濃度 = 0.00825/10 = 0.0825 Mhapi
6.
1.
A. HS⁻
B. H2PO4⁻
C. CO3²⁻
2.
A. Ka = [HS⁻] [H⁺] / [H2S]
B. Ka = [H2PO4⁻] [H⁺] / [H3PO4]
C. Ka = [CO3²⁻] [H⁺] / [HCO3⁻]
3.
HCO3⁻
4.
H3PO4
7.
pOH = -log(0.0054) = 2.3
pH = 14 - pOH = 14 - 2.3 = 11.7