110 REAC 40s dentrying Six Solutions by Their interactions Post-Laboratory Quest
ID: 502401 • Letter: 1
Question
110 REAC 40s dentrying Six Solutions by Their interactions Post-Laboratory Questions (Use the spaces provided for the answars and addisonal paper if nooessary) 1. Briefly describe the method you could use to 2. Based upon your experimental results, the in determine whether or not Pb? ion data ter sample is in a wa- Table 6, and the tests described in the Background suspected to be contaminated with Pb2 Information ion leached the lead solder used to join the cop- (1) What can you conclude about the water por plumbing write the chemical for the pos- of most salts containing NO. ion? Briefly itive test, and equation solubility describe what you would observe. (2) What two solutions could you mixtogether to determine whether mercury chloride (Hg2012 is wa ter soluble? Briefly explain the basis of your choice. (2) If the results of the test you described in (1) were negative, could you conclude that there is no Pb? ion present in the water sample? Briefly explain. (3) Assuming that Hg2Cl2 is not water soluble. write the total equation, the complete ionic equation, and the net ionic equation for the reaction in (2). total equation: complete ionic equation: net ionic equation: "ctonExplanation / Answer
1. (1) Add concentration HCl to water. If a solid precipiate appears , then decant the supernatent liquid and add hot water to it dropwise. The precipitate will dissolve. Now add few drops of K2CrO4. Appearance of yellow colored PbCrO4 will indicate presence of Pb^2+.
2. Pb can still be present in water as Pb^4+.
2. (1) All metal nitrates are soluble in water
(2) Hg2^2+ and HCl can be mixed together to check solubility of Hg2Cl2 in water.
(3) Hg2^2+ (aq) + 2Cl- (aq) -------> Hg2Cl2 (s) <=== Net ionic reaction
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