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Quiz

CHEM 6C

Taryn Conyers 6 perguntas

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Perguntas do quiz (6)

  1. 1CuSCN (s) is poorly soluble in water. What happens to the solubility of CuSCN (s) when this solid
    is placed in 0.1 M CuSO4 relative to its solubility in water? What happens to the solubility of
    CuSCN (s) when this solid is placed in 0.1 M KSCN relative to its solubility in water?
    1. AThe solubility of CuSCN (s) is higher in both 0.1 M CuSO4 and 0.1 M KSCN relative to
      its solubility in water
    2. BThe solubility of CuSCN (s) is higher in 0.1 M CuSO4 but lower in 0.1 M KSCN relative
      to its solubility in water
    3. CThe solubility of CuSCN (s) is lower in 0.1 M CuSO4 but higher in 0.1 M KSCN relative
      to its solubility in water.
    4. DThe solubility of CuSCN (s) is lower in both 0.1 M CuSO4 and 0.1 M KSCN relative to its
      solubility in water.
    5. EThe solubility of CuSCN (s) in 0.1 M CuSO4 and in 0.1 M KSCN does not change
      relative to its solubility in water.
  2. 2What is the pH at the equivalence point of a titration of 0.1 M sodium cyanate (NaCN) with 0.1 M
    HCl?
    1. ApH = 5.90
    2. BpH = 5.10
    3. CpH = 3.05
    4. DpH = 5.25
    5. EpH = 2.90
  3. 3The following would be the best choice for a solution that acts as a buffer around pH 7.
    1. A0.1 M CH3COOH and 0.1 M NaCH3COO
    2. B0.1 M NH4Cl and 0.1 M NH3
    3. C0.1 M HF and 0.1 M NaF
    4. D0.1 M HCOOH and 0.1 M NaCOO
    5. E0.1 M NaH2PO4 and 0.1 M Na2HPO4
  4. 4One hundred grams of AgCl (s) is placed in 1 L of water and allowed to equilibrate. What is the
    quantity of Ag+
    (aq) ions in the 1 L of water? The atomic mass of Ag is 107.9.
    1. A19.4 ng
    2. B17.8 µg
    3. C1.2 g
    4. D50 g
    5. E1.4 mg
  5. 5Calculate the change in pH of a 200 mL buffer solution made up of 0.15 M NH3 (aq) and 0.15 M
    NH4Cl (aq) when 20 mL of 1 M HCl is added.
    1. A+0.70 units
    2. B—0.10 units
    3. C—0.70 units
    4. D+0.10 units
    5. E—0.18 units
  6. 6The indicator phenolphtalein has a Ka,i of 3.16 x 10-10 M. It is colorless at acidic pH’s and red at
    basic pH’s. At what pH would phenolphthalein be pink?
    1. A9.5
    2. B4.3
    3. C12.7
    4. D7.0
    5. E14.0

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Quiz sobre CHEM 6C, criado por Taryn Conyers em 17-03-2015.
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English
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