Top topic this week
Back to FAQs
Related FAQs
Frequently Asked Question
Questions asked by users might not always be phrased in the clearest way.
Predict the predominant reaction that will occur when a solution of chromium ii nitrate, Cr(NO3)2 (aq), is mixed with hydrochloric acid, HCl(aq).rn2 H+(aq) + 2 Cr²+(aq) → H2(g) + 2 Cr³+(aq)rnCr²+(aq) + 2 Cl-(aq) → Cr(s) + Cl2(g)rnCl 2 (g)+cr(s) Cr^ 2+ (aq) + 2c * l ^ (- (aq))rn2n * O_{3} ^ (- (aq)) + 4h ^ (aq) +2 Cr^ 2+ (aq) n 2 o 4 (g)+2 h 2 O(l)+2 Cr^ 3+ (aq)
Accepted Answer
The predominant reaction that will occur when a solution of chromium II nitrate, Cr(NO3)2 (aq), is mixed with hydrochloric acid, HCl(aq) is:
2H+(aq) + 2 Cr²+(aq) → H2(g) + 2 Cr³+(aq)
This reaction is a redox reaction, in which chromium is oxidized from the +2 oxidation state to the +3 oxidation state. The hydrogen ions are reduced from the +1 oxidation state to the 0 oxidation state.
The other reactions you have listed are also possible, but they are not as favorable as the first reaction. The second reaction is the formation of chromium metal, which is a solid. The third reaction is the disproportionation of chromium(II) ions, which is a reaction in which a single species is both oxidized and reduced.
The fourth reaction is the reduction of nitrate ions, which is a reaction that is only possible in acidic solutions. This last reaction will not occur because the solution is acidic enough to prevent this reaction from happening.
Articles you might like