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Quiz #4

Open Notes, Open Neighbor

March 22, 2006

On a piece of paper put your Name, Student ID Number, and Answer to:


Determine if Cr(NO3)3 is acidic, basic, or neutral in aqueous solution. Show the chemical reactions that take place in solution.



Answer:

This is an ionic salt that undergoes cation hydrolysis:

Cr(NO3)3(aq) Cr3+(aq) + 3 NO3(aq)

Cr3+(aq) + 2 H2O(l)CrOH2+(aq) + H3O+(aq)

NO3(aq) + H2O(l) NR

Since hydronium ion is generated, the salt is acidic in aqueous solution.