關於Neutralization的簡單化學問題

Tieria

2009-05-09 6:30 am

1. For each of the following reactions,
(i) name the salt formed.
(ii) Give a full equation for the reaction.
(iii) Give an ionic equation for the reaction.

(a) sodium sulphate + lead (II) nitrate (3 marks)

2. Write full equations (with state) to show how you would carry out the following preparations:
(a) silver bromide from sodium bromide (1 mark)
(b) barium sulphate from barium carbonate (two steps) (2 marks)

3. How would you distinguish between the FeSO4 (aq) and Fe(HSO4)2 (aq) by a simple chemical test? (3 marks)

回答 (1)

老爺子

2009-05-09 8:06 am

✔ 最佳答案

1. (a)
(i)
The precipitate of an insoluble salt of lead(II) sulphate is formed, and the solution contains a soluble salt of sodium nitrate.

(ii)
Na2SO4(aq) + Pb(NO3)2(aq) → PbSO4(s) + 2NaNO3(aq)

(iii)
SO42-(aq) + Pb2+(aq) → PbSO4(s)

2.
(a)
NaBr(aq) + AgNO3(aq) → AgBr(s) + NaNO3(aq)

(b)
BaCO3(aq) + 2HCl(aq) → BaCl2(aq) + H2O(l) + CO2(g)
BaCl2(aq) + Na2SO4(aq) → BaSO4(s) + 2NaCl(aq)

Alternative answers:
BaCO3(aq) + 2HNO3(aq) → Ba(NO3)2(aq) + H2O(l) + CO2(g)
Ba(NO3)2(aq) + K2SO4(aq) → BaSO4(s) + 2KCl(aq)

3.
(HSO4-(aq) ion is quite acidic. The ionization of 1 M HSO4- ion causes a pH of about 1.4 at 25oC. For reference, the pH of 1 M CH3COOH is 2.4 at 25oC.)

Add separately sodium carbonate solution to each of FeSO4(aq) and Fe(HSO4)2(aq).
FeSO4: gives no apparent observable change.
Fe(HSO4)2: gives colourless bubbles of carbon dioxide gas:
Fe(HSO4)2(aq) + Na2CO3(aq) → FeSO4(aq) + Na2SO4(aq) + H2O(l) + CO2(g)
OR: 2H+(aq) + CO32-(aq) → H2O(l) + CO2(g)
=

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