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Chapter 4

Q. 4.1

Predict what will happen when the following pairs of dilute aqueous solutions are mixed.

(a) Cu(NO_{3})_{2} and (NH_{4})_{2}SO_{4}           (b) FeCl_{3} and AgNO_{3}

STRATEGY

1.  Follow the schematic diagram in Figure 4.3.
2. Use the precipitation diagram (Figure 4.2) to determine whether or not the possible precipitates are soluble.

fig 4.3
fig 4.2

Step-by-Step

Verified Solution

Cu^{2+} and NO^{-}_{3} from Cu(NO_{3})_{2}; NH^{+}_{4}  and SO^{2-}_{4} from (NH_{4})_{2}SO_{4}

CuSO_{4} and NH_{4}NO_{3}

Both are soluble, no precipitate forms

(a) Ions in solution Possible precipitates Solubility
Fe^{3+} and Cl^{-} from FeCl_{3}; Ag^{+} and NO^{-}_{3} from AgNO_{3}

AgCl and Fe(NO3)_{3}

Fe(NO_{3})_{3} is soluble, AgCl is insoluble. AgCl precipitates.

(b) Ions in solution Possible precipitates Solubility