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1032第二次化學會考考題影音詳解  
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 1.Give the equation for a saturated solution in comparing Q with Ksp.A) Q > KspB) Q ≠ KspC) Q < KspD) Q = KspE) none of the aboveAnswer: D
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 1.2) Determine the pH of a solution that is 0.15 M HClO2 (Ka = 1.1 x 10-2) and 0.15 M HClO (Ka = 2.9 × 10-8).4.18 3.55 9.82 1.39 12.55Answer: D
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01:39
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 1.3) Calculate the pH of a buffer that is 0.225 M HC2H3O2 and 0.162 M KC2H3O2. The Ka for HC2H3O2 is 1.8 × 10-5.4.74 9.11 9.26 4.60 4.89Answer: D
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00:34
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 1.4) Determine the molar solubility for Al(OH)3 in pure water. Ksp for Al(OH)3 = 1.3 x 10-33.A) 3.6 x 10-12 M   MnXm(s) → nMm+(aq) + mXn−(aq)B) 2.2 x 10-10 MC) 6.0 x 10-19 MD) 4.8 x 10-35 ME) 2.6 x 10-9 MAnswer: E
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00:50
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 1.5) Consider the given acid ionization constants. Identify the strongest conjugate base.NO2- (aq) B) CN-(aq) C) ClO-(aq) D) CHO2-(aq)Answer: B
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00:31
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 1.6) Consider a buffer composed of the weak acid HA and its conjugate base A- . Which pair of concentrations results in the most effective buffer?A) 0.10 M HA; 0.90 M A-B) 0.10 M HA; 0.10 M A-C) 0.90 M HA; 0.10 M A-D) 0.50 M HA; 0.50 M A-Answer: D
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00:27
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 1.7) Determine the [OH-] concentration of a 0.741 M KOH solution at 25°C.A) 0.741 MB) 7.41 MC) 1.34 x 10-14 MD) 1.34 x 10-13 ME) none of the aboveAnswer: A
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00:23
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 1.8) A weak unknown monoprotic acid is titrated with a strong base. The titration curve is shown below. Find Ka for the unknown acid.A) 3.2 × 10-7 B) 3.2 × 10-5 C) 2.5 × 10-9 D) 2.5 × 10-3Answer: B
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00:36
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 1.9) If the pKa of HCHO2 is 3.74 and the pH of an HCHO2/NaCHO2 solution is 3.11, which of the following is TRUE?A) [HCHO2] << [NaCHO2]B) [HCHO2] = [NaCHO2]C) [HCHO2] > [NaCHO2]D) [HCHO2] < [NaCHO2]E) It is not possible to make a buffer of this pH from HCHO2 and NaCHO2.Answer: C
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00:51
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 1.10) A buffer with a pH of 9.85 contains CH3NH2 and CH3NH3Cl in water. What can you conclude about the relative concentrations of CH3NH2 and CH3NH3Cl in this buffer ? For CH3NH2 , pKb = 3.36.A) CH3NH2 < CH3NH3ClB) CH3NH2 > CH3NH3ClC) CH3NH2 = CH3NH3ClD) Nothing can be concluded about the relative concentrations of CH3NH2 and CH3NH3Cl.Answer: A
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01:03
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