ionic equation &colour of ppt

herme519

2013-12-15 11:31 pm

write ionic equations and colour of precipitate for reactions of solutions of alkalis.

a) Solution containing calcium ions and dilute sodium hydroxide solution

b) Solution containing aluminium ions and dilute sodium hydroxide solution

c) Solution containing magnesium ions and dilute sodium hydroxide solution

d) Solution containing iron(II) ions and dilute sodium hydroxide solution

e) Solution containing iron(III) ions and dilute aqueous ammonia

f) Solution containing copper(II) ions and dilute aqueous ammonia

g) Solution containing zinc ions and dilute aqueous ammonia

h) Solution containing ammonium compound and and dilute sodium hydroxide solution ( with heating )

回答 (1)

[匿名]

2013-12-16 6:38 am

✔ 最佳答案

(a)Ca2+(aq) + 2OH-(aq) --> Ca(OH)2(s) <-- white ppt
(b)Al3+(aq) + 3OH-(aq) --> Al(OH)3(s) <-- white ppt
(c)Mg2+(aq) + 2OH-(aq) --> Mg(OH)2(s) <-- white ppt
(d) Fe2+(aq) + 2OH-(aq) --> Fe(OH)2(s) <-- dirty green ppt
(e)Fe3+(aq) + 3OH-(aq) --> Fe(OH)3(s) <--brown ppt
(f)Cu2+(aq) + 2OH-(aq) --> Cu(OH)2(s) <--blue ppt
(g)Zn2+(aq) + 2OH-(aq) --> Zn(OH)2(s) <-- white ppt
(h)NH4+(aq) + OH-(aq) -->NH3(g) + H2O(l)

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