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Week 11 Quiz

Quiz by Kari Stone

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8 questions
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  • Q1

    Which of the following acids (listed with Ka values) and their conjugate base would form a buffer with a pH of 2.34?

    HClO, Ka = 2.9 x 10-8

    HF,  Ka = 3.5 x 10-4

    HCN, Ka = 4.9 x 10-10 

    HClO2, Ka = 1.1 x 10-2

    HC7H5O2, Ka = 6.5 x 10-5

    300s
  • Q2

    Which of the following solutions is a good buffer system?

    A solution that is 0.10 M NaCl and 0.10 M HCl

    A solution that is 0.10 M HNO3 and 0.10 M KNO3

    A solution that is 0.10 M HCN and 0.10 M NaCl

    A solution that is 0.10 M HCN and 0.10 M LiCN

    A solution that is 0.10 M NaOH and 0.10 M HNO3

    300s
  • Q3

    What is the concentration of hydroxide ions in pure water at 30.0∘C, if Kw at this temperature is 1.47E-14 (in M)?

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    300s
  • Q4

    Determine the pH of a 0.023 M HNO3 solution.

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    300s
  • Q5

    How many of the following are WEAK acids?

     

                HCN          HClO2      HNO3       H2PO4

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    300s
  • Q6

    Identify the triprotic acid.

    HClO4 

    HNO3 

    H3PO4 

    H2SO4 

    H2SO3 

    300s
  • Q7

    The weaker the acid, then which of the following is TRUE?

    The weaker the conjugate base.

    The weaker the conjugate acid.

    The stronger the conjugate base.

    The stronger the conjugate acid.

    300s
  • Q8

    Determine the pH of a 0.22 M NaF solution at 25°C.  The Ka of HF is 3.5 E10-5.

    8.90

    300s

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