Unknown Compounds

First, two grams on an unknown white compound were given. The possible compounds the known could be were CaCO3, KNO3, NH4Cl, CaCl2, K2SO4, (NH4)2SO2, Ca(NO3)2, NaC2H2O2, K2CO3, MgCl2, Na2CO3, 0.1 M AgNO3, MgSO4, NaCl, 0.2 M BaCl2, KCl, NaSO4, Mg(s), HCl, HNO3, NaOH, HC2H3O2, H2SO4, and KOH. The solubility test required using a scale to measure .575 of our unknown white compound. The unknown compound was measured in a 100 mL beaker. Next, a 100 mL graduated cylinder was used to measure 60 mL of distilled water. The water was added to the compound and stirred with a glass-stirring rod until dissolved. Next, The flame test required the solution made during the solubility test. The experiment needed a metal wire that was dipped into the solution

interface which plugged into a computer and Logger Pro opened. To calibrate the probe, Experiment-Set Up Sensors-Showed All Interfaces was selected and then Calibrate Now was on. The probe was cleaned in distilled water and dried. Then the probe was placed into a buffer solution. There was two buffer solutions, one with a pH of 4.00 and the other with a pH of 7.00. Each buffer was measured in a 100 mL graduated cylinder and contained in a 40 mL beaker. Once the reading of the buffer was stabilized, the program entered into reading 1. The probe was cleaned with distilled water and dried before being placed into the second buffer for reading 2. Once the second calibration was completed the pH probe was cleaned again. Next the probe was placed into the unknown solution. The unknown solution contained 20+ -0.05 mL of the unknown in a 40 mL beaker. A 10 mL graduated cylinder was used to accurately measure. The pH value of the unknown was recorded, and then the probe was removed again and cleaned. Last, the pH probe was placed into potassium nitrate. The potassium nitrate was contained in a 40 mL beaker, .520+ -.0005g of KNO3 dissolved in 20+ -0.5 mL. A 10 mL graduated cylinder was used to accurately measure. The pH of potassium nitrate was recorded and the probe was removed and

The probe was cleaned with distilled water and dried before placing into the unknown solution. The solution was .500+-.0005g of the unknown compound dissolved in 20+-0.5mL of water contained in a 40 mL beaker. A 10 mL graduated cylinder was used to measure accurately. The conductivity of the unknown compound was recorded and then the probe was removed and cleaned. Next, the probe was placed in potassium nitrate solution. The solution contained .500+-.0005g of KNO3 dissolved in 20+-.5 mL of water in a 40 mL beaker. The probe recorded the conductivity of potassium