aqueUu established by adding The main equilibrium is copper(II) sulfate acid is

Question

aqueUu established by adding The main equilibrium is copper(II) sulfate acid is added. Change 1. To the main equilibrium, hydrochloric Change 2. To the main equilibrium, aqueous sodium phosphate is A., i) Tribromocuprate(II) ion dissociates to form aqueous co bromide ion. ii) Precipitation of mercury(I) bromide B. i) Dissociation of solid chromium(III) hydroxide ii) The reaction of H with hydroxide ion. C. i) Dissociation of tetrachloronickelate(II) ion to form a chloride ion. ii) Precipitation of silver(l) chloride D. i) Dissociation of solid magnesium fluoride. ii) The reaction of H with fluoride ion. Reading Assignment: Group 3 Discussion Work: Group 3 Net Ionic Equations & Flowe Next Ouiz

Explanation / Answer

Solution:- (B) Chromium(III)oxide is Cr(OH)3 as tge roman numeral tells us about the oxidation state of the metal ion. On dissociation, Cr(OH)3 would give it's ions Cr3+ and OH- and the equation could be written as...

Cr(OH)3(s) -----> Cr3+(aq) + 3OH-(aq) ........................(i)

this OH- reacts with H+ to form water. The equation could be written as..

OH-(aq) + H+(aq) -----> H2O(l) ....................(ii)

first equation has 3OH- and second equation has only one OH-, so to balance this we need to multiply the second equation by 3.

3OH-(aq) + 3H+(aq) -----> 3H2O(l)

Now on adding these two equations 3OH- is canceled out as it is intermediate(spectator ion). The final net ionic equation is....

Cr(OH)3(s) + 3H+(aq) ----> Cr3+(aq) + 3H2O(l) .........(iii)

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