Quiz Submissions - Lesson 5 Quiz CHEM134 C001 Fall Questions And Answers Rated A+ New Update Assured Satisfaction

Quiz Submissions - Lesson 5 Quiz CHEM134 C001 Fall
Questions And Answers Rated A+ New Update Assured
Satisfaction




Question 1 points

A solution may contain the following ions Ag+, Cu2+, Cd2+, Mn2+, Ni2+ and Na+. A white
precipitate formed when 0.10 M NaCl was added and after this was removed the solution was
treated with H2S gas under acidic conditions and no precipitate formed. When the solution was
made basic and again treated with H2S gas a dark colored precipitate formed. If no further tests
were made then what conclusions can you draw?


possible ions present Ag+, Mn2+, Ni2+

possible ions present Ag+, Cu2+, Cd2+

possible ions present Ag+, Cu2+, Cd2+, Na+


possible ions present Ag+, Mn2+, Ni2+, Na+



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Question 2 points

How many moles of CaF2 will dissolve in 3.0 L of 0.052 M NaF solution? (Ksp for CaF2 = 4.0 x
10–11)




1/11

, 2.6 x 10–10


1.5 x 10–8


4.4 x 10–8


4.9 x 10–9



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Question 3 points

What is the molar solubility of AgCl in 0.20 M NH3? Ksp for AgCl is 1.8×10-10 and Kf for
Ag(NH3)2+ is 1.7×107.




1.3 × 10-5 M


5.5 × 10-2 M


1.1 × 10-2 M



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Question 4 points

Calculate the solubility of Cu(OH)2 in a solution buffered at pH = 7.48. (Ksp = 1.6 x 10–19)




2/11