5.4) Post-Lab Questions name section date 1. (a) Briefly describe the method you

Question

5.4) Post-Lab Questions name section date 1. (a) Briefly describe the method you could use to determine whether or not Pb ion is present in a water sample suspected to be contaminated with Pb2+ ion leached from the lead solder used to join the copper plumbing. Write the chem- ical equation for the positive test, and describe what you would observe. (b) If the results of the test you described in (a) were negative, could you conclude that there is no Pb++ ion present in the water sample? Briefly explain. 2. Based upon your experimental results, the data in Table 6, and the tests described in the Background Information (a) What can you conclude about the water solubility of most salts containing NO ion? Briefly explain. (b) What two solutions could you mix together to determine whether mercury(I) chloride (Hg Cl2) is water soluble? Briefly explain the basis of your choice. (c) Assuming that Hg2Cl2 is not water soluble, write the total equation, the com- plete ionic equation, and the net ionic equation for the reaction in (b).

Explanation / Answer

1.

(a)

Pb2+ (aq.) + 2 HCl (aq.) ------------> PbCl2 (s) + 2 H+ (aq.)

(b)

Yes. Absence of white on above test concludes that the Pb2+ ion is absent.

2.

(a) Almost all metal nitrates are solubel in water.

(b) Hg2(NO3)2 (aq.) + 2 HCl (aq.) -----------> Hg2Cl2 (s) + 2 HNO3 (aq.)

(c)

Complete ionic equation:

Hg22+ (aq.) + 2 NO3- (aq.) + 2 H+ (aq.) + 2 Cl- (aq.) ---------> Hg2Cl2 (s) + 2 H+ (aq.) + 2 NO3- (aq.)

Net ionic equation:

Hg22+ (aq.) + 2 Cl- (aq.) -------------> Hg2Cl2 (s)

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