Question

1.Write the complete molecular equation for the reaction of Zn(NO3)2 and KOH. Use the "\piπ" button to enter the equation using the equation format and be sure to include the appropriate states of matter.

2.Write the net ionic equation for the reaction in question 1. Use the "\pi π" button to enter the equation using the equation format and be sure to include the appropriate states of matter.

3.What are the spectator ions in for the reaction in question 1? Use the "\piπ" button to enter the equation using the equation format and be sure to include the appropriate charges on the ions.

4. The reaction in question 1 is run and the precipitate removed via filtration. The filtrate (solution which passes through the filter) is collected. We know that the spectator ions should be present, however, one of the active ions is probably limiting and the other active ion is in excess. How could you test for the presence of zinc(II) ions on the filtrate?

5.For the same experiment in the question above, how would you test for the presence of hydroxide ions in the filtrate? (Keep in mind that testing for pH is not a valid test in this case).

Answer 1

(1)

Zn(NO₃)₂ + 2KOH ----> Zn(OH)₂ + 2KNO₃

state aquous   aquous solid   aquous

(2)

Zn²⁺ + 2NO₃^-  + 2K⁺ + 2OH^- ------> Zn(OH)₂ + 2K⁺ + 2NO₃^-

state aquous aquous aquous  aquous solid   aquous aquous
(3)

Zn²⁺ + 2(OH^-) -------> Zn(OH)₂

state aquous   aquous solid

(4)

simple method for that is......

1. Conduct Ash Test

-take salt in solution and add 2-3 drops of Cobalt Nitrate and 1 drop of concentrated Nitric Acid.

-take filter paper and dip in the solution, and burn it . if u find green color ash at the end, it is confirmed precence of the Zn⁺².

(5)

-add copper sulfate in in nitric acid followed by barium chloride solution ( white precipitate will be observed).

-Add filtrate then heat.  ( if u observed rusty brown prcipitate then there is presence of hydroxide ion in it.)

(most simple method is doing titration with acid)