This topic contains a solution. Click here to go to the answer

Author Question: A precipitate forms when a solution that is 0.10 M in Cu2+, Pb2+, and Ni2+ is saturated with H2S and ... (Read 92 times)

ereecah

  • Hero Member
  • *****
  • Posts: 530
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.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

kswal303

  • Sr. Member
  • ****
  • Posts: 316
Answer to Question 1

d

Answer to Question 2

d

Answer to Question 3

c




ereecah

  • Member
  • Posts: 530
Reply 2 on: Aug 23, 2018
Excellent


bblaney

  • Member
  • Posts: 323
Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

 

Did you know?

Though methadone is often used to treat dependency on other opioids, the drug itself can be abused. Crushing or snorting methadone can achieve the opiate "rush" desired by addicts. Improper use such as these can lead to a dangerous dependency on methadone. This drug now accounts for nearly one-third of opioid-related deaths.

Did you know?

The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.

Did you know?

A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

Did you know?

As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

Did you know?

Patients should never assume they are being given the appropriate drugs. They should make sure they know which drugs are being prescribed, and always double-check that the drugs received match the prescription.

For a complete list of videos, visit our video library