Chemistry - Ans.fyi 參考答案

Chemistry

[匿名]

2011-07-29 5:00 am

when element X is added to concentrated nitric acid, a brown gas is evolved. the unreacted element is then removed from the reaction mixture. A bluish-green solution Y remains. When a Few drops of dilute sodium hydroxide solution are added to Y, a pale blue precipitate forms.
a) Name element X
b) Write an ionic equation for the reaction between X and concentrated nitric acid
c) How would you separate the unreacted element from the reaction mixture?
d) Name the solution Y
e)Write an ionic equation for the reaction between solution Y and dilute sodium hydroxide solution

回答 (1)

不用客氣

2011-07-29 10:10 am

✔ 最佳答案

a)
copper

b)
Cu(s) + 4H^+(aq) + 2NO3^-(aq) → Cu^2+(aq) + 2H2O(l) + 2NO2(g)

c)
(Firstly dilute the reaction mixture with water.) Use filtration to separated the unreactedelement from the reaction mixture, and the only residue is the unreactedmixture. (The residue should be washedwith distilled water, and then dry.)

d)
copper(II) sulphate solution

e)
Cu^2+(aq) + 2OH^-(aq) → Cu(OH)2(s)

參考: micatkie

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