Question

Three test tubes contain calcium nitrate solution, zinc nitrate solution and lead nitrate solution respectively. Each solution is divided into two portions. 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 till it is in excess. 

Answer 1

Solution	Effect of adding sodium hydroxide solution			Effect of adding ammonium hydroxide solution
	Small amount	In  excess	Small amount	In excess
Calcium nitrate	A white precipitate	No change	No precipitate	No change.
Zinc nitrate	A white ppt.	White ppt. dissolves, gives a colourless solution	A white ppt.	A white ppt. dissolves to give a colour less solution.
Lead nitrate	A white ppt.	White ppt. dissolves to give a colourless solution.	A white ppt	No change.