Question

The major chemical species in the titrated solution (the analyte solution) at equivalence point is HA...

  1. The major chemical species in the titrated solution (the analyte solution) at equivalence point is
    1. HA
    2. HA and A- where [HA]= [A-]
    3. A-
    4. HA and A- where [HA]= ½ [A-].

  1. The charge on the complex ion that contains one Fe+2 ion and six CN- ions is:
    1. +1
    2. 0
    3. +2
    4. -4
    5. -2

  1. You are given that the Ksp of Ca(OH)2 and Mg(OH)2 are: 4.68X10-4 and 2.06X10-13, respectively. A significant amount of NaOH was added gradually to a solution containing equal concentration of Mg(NO3)2 and Ca(NO3)2. What do you think will happen:
  1. Nothing
  2. Mg(OH)2 will precipitate first then Ca(OH)2
  3. Ca(OH)2 will precipitate first then Mg(OH)2
  4. Mg(OH)2 and Ca(OH)2 will precipitate simultaneously
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Homework Answers

Answer #1

Solution:

1) Answer is : C (explantion: at the stoichiometricg point major species is A- because is a base pH would be greater than 7)

2) Charge on the Complex ion is -4 for [Fe(II)(CN-)6]4-

3) Answer is : B (i.e. Mg(OH)2 precipitates first then Ca(OH)2 )

Explantion: Since the Mg(OH)2 Ksp is 2.06X10-13 is smaller than the Ca(OH)2 4.68X10-4 . Meaning greater the Ksp greater the solubility or lesser the possibility of precipitation. In this case Ca(OH)2 Ksp isgreater so precipitates slower than Mg(OH)2.

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