REACTIONS OF THE SILVER GROUPOBJECTIVES:1. Observe the colors of the products formed in the reactions2. Develop a systematic method that will identify the ions of the group

CONCEPTSGALING KAY KUYA BONCALOS AND MARIE

MATERIALS:Ag+ T.S2M HClK2CrO4 soln.Test tubesPb 2+ T.S6M NH4OHKI soln.Test tube rackHg2 2+ T.S6M NaOHBeakersTripodAlcohol LampWire Gauze

PROCEDURES:1. In separate test tubes, place 5 drops each of the test solutions for Ag+, Pb 2+, Hg2 2+ and perform the succeeding tests.2. Place 2-3 drops of 2M HCl. Stir and divide into 2 portions.a. To a portion, test the solubility of the precipitate by adding 5 drops of boiling water and heating the test tube in a water bath.b. To the other portion, add 5 drops of 6M NH4OH. Describe the results obtained.3. Add 1 drop of 6M NH4OH in each of the test tubes (1) and stir. Describe the results. Divide into 2 portions.a. To one portion, continue adding NH4OH until the precipitation have reached the maximum and add 3-5 drops more in excess. Note in which test tube the precipitate dissolves.4. To the test solutions (1), add one drop of 6M NaOH. Describe the results. Divide into 2 portions.a. To one portion, add 4-5 drops more in excess of NaOH and note in which test tube the precipitate dissolves.5. To the test solutions (1), add 1 drop of K2CrO4 solution. Note the colors formed. Which precipitate dissolves?6. Add 1 drop of KI solution to the test tubes (1). Describe the results. Divide into 2 portions.a. To one portion, add 3-5 drops more in excess of KI. Observe any changes.

DATA SHEETREAGENTSAg+Pb 2+Hg2 2+

FORMULACOLOR & NATUREFORMULACOLOR & NATUREFORMULACOLOR & NATURE

2) HClAgClWhite pptPbCl2White pptHg2Cl2White ppt

a) boiling waterAgOHClear soln (soluble)Pb(OH)2Clear soln (soluble)Hg2 (OH)2Clear soln (soluble)

b)excess NH4OHAgOHsolublePb(OH)2White pptHgNH2ClWhite ppt

3) NH4OHAgOHWhite pptPb(OH)2White pptHgNH2ClWhite ppt

a)excessAg(NH3)2OHsolublePb(OH)2insolubleHg2 (OH)2insoluble

4) NaOHAgOHWhite pptPb(OH)2Colorless soln with white pptHg2OBlack ppt

a)excessAgOHinsolubleNa2PbO2Clear soln (soluble)HgOinsoluble

5) K2CrO4Ag2CrO4Brownish red pptPbCrO4Colorless soln with yellow pptHg2CrO4Orange-red ppt

a)NaOHPb(OH)2Yellow,clear soln (soluble)

6) KIAgICanary yellow pptPbI2Yellow pptHg2I2Green/greenish-yellow ppt

a)excessPbI2Yellow ppt (soluble)K2HgI4Colorless soln with black ppt

Yellow ppt (Pb 2+ 4-6)Yellow,clear soln(Pb 2+ 4-5a)

Colorless soln with yellow ppt (Pb 2+ 4-5)Clear soln (Pb 2+ 4-4a)

Colorless soln with white ppt (Pb 2+ 4-4)

White ppt(Pb 2+ 4-3a)White ppt(Pb 2+ 4-2)

White ppt(Pb 2+ 4-2)In the water bathwhite ppt (Pb 2+ 4-3)

white ppt (Ag + 4-2)white ppt (Pb 2+ 4-2b)

Clear soln(Hg2 2+ 4-2a)white ppt (Ag + 4-2)