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Author Question: A precipitate forms when a solution that is 0.10 M in Cu2+, Pb2+, and Ni2+ is saturated with H2S and ... (Read 97 times)

ereecah

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on: Aug 23, 2018
A precipitate forms when a solution that is 0.10 M in Cu2+, Pb2+, and Ni2+ is saturated with H2S and adjusted to pH = 1. What sulfides are present in the precipitate?
  H2S = 0.10 M; for H2S, Ka1  Ka2 = 1.1  1024
  Ksp: CuS = 8.5  1045, PbS = 7.0  1029, NiS = 3.0  1021
   
  a.
  CuS, PbS, and NiS
   
  b.
  PbS and NiS
   
  c.
  NiS
   
  d.
  CuS and PbS
   
  e.
  CuS

Question 2

The concentration of Mg2+ in seawater is 0.052 M. At what pH will 99 of the Mg2+ be precipitated as the hydroxide? Ksp for Mg(OH)2 = 8.9  1012
   
  a.
  8.35
   
  b.
  9.22
   
  c.
  6.50
   
  d.
  10.12
   
  e.
  4.86

Question 3

If 30 mL of 5.0  104 M Ca(NO3)2 are added to 70 mL of 2.0  104 M NaF, will a precipitate occur? (Ksp of CaF2 = 4.0  1011)
   
  a.
  No, because the ion product is greater than Ksp.
   
  b.
  Yes, because the ion product is less than Ksp.
   
  c.
  No, because the ion product is less than Ksp.
   
  d.
  Not enough information is given.
   
  e.
  Yes, because the ion product is greater than Ksp.


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kswal303

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Reply #1 on: Aug 23, 2018
Answer to Question 1

d

Answer to Question 2

d

Answer to Question 3

c


ereecah

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Reply 2 on: Aug 23, 2018
Great answer, keep it coming :)

sultana.d

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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