4) Hydrogen sulfide H2S is a volatile acid that equilibrates, in closed systems, with aqueous solutions according to the reaction: For a gaseous phase containing H2Sn equilibrium with water, in a closed vessel, calculate a) The Henry's law constant, KH, for H2S. Note that KH= Keq for the two phase conecntraion n wre of lHISp water it concentration in water is CTS_ [H2S(aq)]+[HS]+[$4, is 1-10% M and the solution pH is 8.5. The dissociation reactions of H2S) n the water phase are partitioning reaction given above. b) The partial pressure of H2Sg) overlying the water if the total soluble sulfide described by Kax ka2
The figure below illustrates the volumes that are designated by Vtube and Vsyr .
Note also that Vsyr = Vf â Vi .
The table below contains data collected for one run of the required reaction, where an unknown sample mixture containing some NaHCO3 is mixed with hydrochloric acid:
Value
Units
Initial Weight of container (empty)
18.4395
g
Final Weight of container and unknown
18.6185
g
Volume of hydrochloric acid
10.0
mL
Volume of tube, Vtube (see Figure above)
92.3
mL
Initial volume of syringe (Vi)
5.0
mL
Final volume of syringe (Vf)
50.7
mL
Temperature
26.5
oC
Atmospheric Pressure
764.4
Torr
Vapor Pressure of Water at 26.5 oC
25.8
Torr
Use this data to answer the following questions. The appropriate units are specified in the each question. Pay close attention to the number of significant figures in your answers.
weight of sample (g) mixture before the start of the reaction = .179 g. Volume of CO2 gas (mL) that is produced by the reaction and is now contained in the syringe= 45.7 mL
1.
What is the mass percent of NaHCO3 in the mixture sample ?
Enter a numeric answer only, to the correct number of significant figures. Do not include units with your answer.
The figure below illustrates the volumes that are designated by Vtube and Vsyr .
Note also that Vsyr = Vf â Vi .
The table below contains data collected for one run of the required reaction, where an unknown sample mixture containing some NaHCO3 is mixed with hydrochloric acid:
Value
Units
Initial Weight of container (empty)
18.4395
g
Final Weight of container and unknown
18.6185
g
Volume of hydrochloric acid
10.0
mL
Volume of tube, Vtube (see Figure above)
92.3
mL
Initial volume of syringe (Vi)
5.0
mL
Final volume of syringe (Vf)
50.7
mL
Temperature
26.5
oC
Atmospheric Pressure
764.4
Torr
Vapor Pressure of Water at 26.5 oC
25.8
Torr
Use this data to answer the following questions. The appropriate units are specified in the each question. Pay close attention to the number of significant figures in your answers.
weight of sample (g) mixture before the start of the reaction = .179 g. Volume of CO2 gas (mL) that is produced by the reaction and is now contained in the syringe= 45.7 mL
1.
What mass (g) of NaHCO3 was contained in the sample mixture that was mixed with HCl ?
Enter a numeric answer only, to the correct number of significant figures. Do not include units with your answer.