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Write the balanced chemical equation for each of these reactions. Include phases. 1) When aqueous sodium...

Write the balanced chemical equation for each of these reactions. Include phases.

1) When aqueous sodium hydroxide is added to a solution containing lead(II) nitrate, a solid precipitate forms.

2) However, when additional aqueous hydroxide is added the precipitate redissolves forming a soluble [Pb(OH)4]2-(aq) complex ion.

Solutions

Expert Solution

1) When aqueous sodium hydroxide (NaOH) is added to lead (II) nitrate [Pb(NO3)2] a double displacement reaction occurs initially leading to the formation of sodium nitrate and a dirty white precipitate of lead hydroxide as shown in the equation below with their phases.

2NaOH (aq) + Pb(NO3)2 (aq)                                             2NaNO3 (aq) + Pb(OH)2 (s)

2) Again, when excess amount of NaOH is added to the reaction mixture, then the white precipitate re-dissolves to form a complex ion which is again soluble in the aqueous phase as shown in the equation below.

Pb(OH)2 (s) + 2NaOH (aq)                      Na2[Pb(OH)4](aq)

queen_honey_blossom answered 1 year ago
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