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13 Dec 2019
Molarity of standard NaOH solution: x/1 H 2/3 Unknown + 2/3 NaOH -> 2/3 H2O +Na 2/3 Acetate
Vinegar: Titration 1 Titration 2 Tirtration 3 Initial V of Acid .01 mL 5.56 mL 11.32 mL Final V of Acid 5.56 mL 10.71 mL 16.02 mL Inital V of Base .01 mL 27.12 mL 3.01 mL Final V of Base 22.23 mL 44.71 mL 24.90 mL
Unknown Acid code and number of reactive hydrogens: H+3
Unknown Acid Titration 1 Titration 2 (Error) Titration 3 Titration 4 Mass of Acid .1024 g .1028g .1021g .1023g Initial V of Base 24.90 mL 37.80 mL 45.5 mL 9.24 mL Final V of Base 37.80 mL 45.5 mL 9.24 mL 17.80 mL
14. Average your three formula masses to get your final answer for the formula mass of
your unknown acid.
15. Calculate the percent deviation for each of your three formula masses.
16. AgBr reacts with Na2S2O3 according to the following equation:
AgBr (s) + 2 Na2S2O3 (aq) ==> Na3Ag(S2O3)2 (aq) + NaBr (aq)
How many milliliters of 0.0138 M Na2S2O3 are needed to dissolve 0.250 g of AgBr?
17. Write the balanced double displacement reaction for Pb(NO3)2 reacting with NaCl.
How many milliliters of 0.750 M Pb(NO3)2 are required to react completely with 525 mL of 2.25 M NaCl?
Molarity of standard NaOH solution: x/1 H 2/3 Unknown + 2/3 NaOH -> 2/3 H2O +Na 2/3 Acetate
Vinegar: | Titration 1 | Titration 2 | Tirtration 3 |
Initial V of Acid | .01 mL | 5.56 mL | 11.32 mL |
Final V of Acid | 5.56 mL | 10.71 mL | 16.02 mL |
Inital V of Base | .01 mL | 27.12 mL | 3.01 mL |
Final V of Base | 22.23 mL | 44.71 mL | 24.90 mL |
Unknown Acid code and number of reactive hydrogens: H+3
Unknown Acid | Titration 1 | Titration 2 (Error) | Titration 3 | Titration 4 |
Mass of Acid | .1024 g | .1028g | .1021g | .1023g |
Initial V of Base | 24.90 mL | 37.80 mL | 45.5 mL | 9.24 mL |
Final V of Base | 37.80 mL | 45.5 mL | 9.24 mL | 17.80 mL |
14. Average your three formula masses to get your final answer for the formula mass of
your unknown acid.
15. Calculate the percent deviation for each of your three formula masses.
16. AgBr reacts with Na2S2O3 according to the following equation:
AgBr (s) + 2 Na2S2O3 (aq) ==> Na3Ag(S2O3)2 (aq) + NaBr (aq)
How many milliliters of 0.0138 M Na2S2O3 are needed to dissolve 0.250 g of AgBr?
17. Write the balanced double displacement reaction for Pb(NO3)2 reacting with NaCl.
How many milliliters of 0.750 M Pb(NO3)2 are required to react completely with 525 mL of 2.25 M NaCl?
Nestor RutherfordLv2
17 Dec 2019