Pre laboratory Assignment 1 HCl aq NaHCO3 s NaCl aq H2O l CO2 g H2SO4 aq 2NaHCO3 s Na2SO4 aq 2H2O l 2CO2 g If the acid is HCl Unbalanced reaction HCl aq NaHCO3 s NaCl aq H2O l CO2 g Trial Volume Acid mL Moles Acid Mass NaHCO3 g Moles NaHCO3 Moles CO2 produced Limiting reactant 0 84 1 26 1 68 2 10 2 52 2 94 3 36 0 84 1 26 1 68 2 10 2 52 2 94 3 36 1 2 3 4 5 6 7 1 2 3 4 5 6 7 40 0 35 0 30 0 25 0 20 0 15 0 10 0 0 040 0 035 0 030 0 025 0 020 0 015 0 010 40 0 35 0 30 0 25 0 20 0 15 0 10 0 0 040 0 035 0 030 0 025 0 020 0 015 0 010 0 010 0 015 0 020 0 025 0 030 0 035 0 040 0 010 0 015 0 020 0 025 0 030 0 035 0 040 0 010 0 015 0 020 0 025 0 020 0 015 0 010 NaHCO3 NaHCO3 NaHCO3 both HCl HCl HCl 0 010 0 015 0 020 0 025 0 030 0 015 0 010 NaHCO3 NaHCO3 NaHCO3 NaHCO3 NaHCO3 H2SO4 H2SO4 Unbalanced reaction H2SO4 aq NaHCO3 s Na2SO4 aq H2O l CO2 g If the acid is H2SO4 Trial Volume Acid mL Moles Acid Mass NaHCO3 g Moles NaHCO3 Moles CO2 produced Limiting reactant Lab Questions 1 Acid A Acid B Each flask had same amount of HCl and amount of baking soda added increased through trial 1 7 Size of the balloon slightly increased to balloon 1 4 From balloon 5 size of the balloon decreased trial 1 7 all had reaction because clear liquid turned into cloudy white liquid Each flask had same amount of HCl and amount of baking soda added to the flask increased through trial 1 7 Size of the balloon slightly increased through trail 1 5 Size of the balloon started to decrease from trail 6 Trial 7 had smallest balloon None of the trials had reaction since liquid remained clear liquid No solid was formed 2 In Acid A the balloons increase through trial 1 4 however start to decrease in trail 5 This is because limiting reactant in trial 1 4 is NaHCO3 and in trail 5 7 limiting reactant change to HCl Acid A coefficient ratio of HCl to NaHCO3 is 1 1 So whichever reactant had smallest number of moles would become limiting reactant In Acid B the balloon size increase through trial 1 5 and starts to decrease through trial 6 7 This is because limiting reactant in trail 1 5 was NaHCO3 and 6 7 is H2SO4 Acid B coefficient ratio of HCl to NaHCO3 is 1 2 So HCl need twice as much as moles of NaHCO3 3 Acid A is HCl and Acid B is H2SO4 The size of the balloon starts to increase and decreased according to the BCA table with the amount of CO2 produced Additional Questions 1 E a False because mass in gram doesn t matter but in moles b False because rather than smallest coefficient in the balance equation presented number of moles and the ratio of coefficient determine the limiting reactant c False because molar mass doesn t matter but in moles d Left over after the reaction is excess not limiting reactant 3 True 2 A only 2 moles of A is required since every one mole of A requires 3 moles of B Since there is 6 moles of B you can take up to 2 moles of A Ratio of A to B is 1 2 2 00M x 0 02L x 0 04 mol HCl 10 0M 0 04 y Y 0 004L 4 00mL Take 4 00mL of the 2 00M solution of hydrochloric acid and add water until its 20 0mL 4 B a 0 1M x 0 4 X 0 04mol NaCl NaCl b 0 1M x 0 3 X 0 03mol CaCl2 CaCl2 c 0 1M x 0 2 X 0 02 FeCl3 FeCl3 d 0 1M x 0 2 X 0 02mol KBr KBr e 0 1M x 0 8 0 04mol Na 0 04mol Cl 0 08 mol 0 03 mol Ca 0 06mol Cl 0 09 mol 0 02mol Fe 0 06mol Cl 0 08 mol 0 02mol K 0 02mol Br 0 04 mol X 0 08 mol C12H22O11 Just 0 08 mole since sucrose does not dissolve