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Zinc Ion

aName the gas...

Question

a)Name the gas in each of the following
b) State one observation for each of the following
Excess ammonium hydroxide is added to lead nitrate solution

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Solution

a) No gas is evolved when excess ammonium hydroxide is added to lead nitrate solution.
b) When ammonium hydroxide is added to lead nitrate, a white precipitate is formed. The precipitate is lead hydroxide.
When excess ammonium hydroxide is added, no change.
Pb(NO₃)₂(aq) + 2NH₄OH(aq) $\to$ Pb(OH)₂(s)+ 2NH₄NO₃(aq)

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Q. State the effect of adding a small amount of: (a) sodium hydroxide (b) ammonium hydroxide followed by an excess in each case to samples of each of the salt solutions.
(i) calcium nitrate [small amount .......... in excess ..........].
(ii) zinc nitrate [small amount ........... in excess ............].
(iii) lead nitrate [small amount ........... in excess .........].

Q. Three test tubes contain calcium nitrate solution, zinc nitrate solution and lead nitrate solution respectively. Each solution is divided into two portions (i) and (ii). Describe the effect of
(i) adding sodium hydroxide solution to each portion in turn till it is in excess.
(ii) adding ammonium hydroxide to each portion in turn till it is in excess.

State one observation for the following:

(i) Excess ammonium hydroxide solution is added to lead nitrate solution.

Q. State one observation for each of the following:
Excess ammonium hydroxide solution is added to lead nitrate solution.

State two relevant observations for each of the following:

Ammonium hydroxide solution is added to zinc nitrate solution in minimum quantities and then in excess.

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