What do you observe when caustic soda solution is added to the following solution: first a little and then in excess. (c) $Pb(NO_3)_2,$ (d) $CuSO_4$? Write balanced equations for these reactions.

Home » What do you observe when caustic soda solution is added to the following solution: first a little and then in excess. (c) (d) ? Write balanced equations for these reactions.

What do you observe when caustic soda solution is added to the following solution: first a little and then in excess.
(c) $Pb(NO_3)_2,$
(d) $CuSO_4$ ? Write balanced equations for these reactions.

Analytical Chemistry: Uses of Ammonium Hydroxide and Sodium Hydroxide | Chemistry | Class 10 | ICSE | Selina

What do you observe when caustic soda solution is added to the following solution: first a little and then in excess.
(c) $Pb(NO_3)_2,$
(d) $CuSO_4$ ? Write balanced equations for these reactions.

Solution:

Caustic soda is Sodium hydroxide (NaOH)

(c)

Pb(NO₃)2 + 2NaOH → Pb(OH)₂ ↓ {White ppt. (colourless)}+ 2NaNO₃

In excess of alkali, the white precipitate of Pb(OH)₂ becomes soluble.

Pb(OH)₂ + 2NaOH → Na₂PbO₂ {(excess) Sodium Plumbate (colourless)} + 2H₂O

(d)

CuSO4 + 2NaOH → Cu(OH)₂ ↓ {Pale blue ppt.}+ 2NaSO₄

In excess of alkali, the pale blue precipitate of Cu(OH)₂ is soluble.

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