Potassium trioxochlorate (V) undergoes thermal decomposition according to the fotpowing equation: 2KCIO\(_3\) \(\to\) 2KCI + 3O\(_2\) (a) What substance cou...
Question 1 Report
Potassium trioxochlorate (V) undergoes thermal decomposition according to the fotpowing equation: 2KCIO\(_3\) \(\to\) 2KCI + 3O\(_2\)
(a) What substance could be used in the laboratory to in ease the rate of the reaction
(ii) absorb the oxygen produced
(b) Give the reason why an aqueous solution of silver trioxonitrate (V) gives a white precipitate with KCI but not with KClO\(_3\).
Answer Details
Thermal decomposition: \( 2KClO_3 \to 2KCl + 3O_2 \)
(a)(i) Substance to increase the rate of the reaction (a catalyst): manganese(IV) oxide, MnO2.
(ii) Substance to absorb the oxygen produced: alkaline pyrogallol solution (pyrogallol in KOH).
(b) An aqueous solution of silver trioxonitrate(V) gives a white precipitate (AgCl) with KCl because KCl contains free chloride ions, Cl-:
\[ Ag^+ + Cl^- \to AgCl\downarrow \]
KClO3 gives no precipitate because its chlorine is locked in the chlorate ion, ClO3- (not free Cl-), and silver chlorate, AgClO3, is soluble in water. Only free chloride ions form the insoluble AgCl.
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