In the lab, 1. we put sodium oxalate into lead nitrate 2. we put sulphuric acid...

In the lab,

1. we put sodium oxalate into lead nitrate

2. we put sulphuric acid into lead nitrate

After both solution has precipated, we removed the liquids and pour nitric acid to each of precipitates in seperate test tubes.

The observation was that

First tube was much thinner and the second tube become much thicker (in terms of white-ish color) after adding nitric acid.

What is the reason for this difference?

Solutions

Expert Solution

The reactions are

1) Na₂C₂O₄(aq) + Pb(NO₃)₂(aq) 2 NaNO₃(aq) + PbC₂O₄(s)

2) H₂SO₄ (aq) + Pb(NO₃)₂ (aq) PbSO₂ (s) + 2 HNO₃ (aq)

Lead oxalate in nitric acid leads to the formation of a compound called oxalo-nitrate of lead which has some solubility in nitric acid.

Lead Sulphate is insoluble or poorly soluble in diluted acids.
Hot concentrated HNO₃ dissolves PbSO₄ moderately because of equilibrium reaction
2PbSO₄ + 2HNO₃ Pb(HSO₄)₂ + Pb(NO₃)₂

queen_honey_blossom answered 1 year ago

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