What is the molarity of a potassium triiodide solution, KI3(aq), if 30.00 mL of the solution is required to completely react with 25.00 mL of a 0.200 M thiosulfate solution, K2S2O3(aq)?
The chemical equation for the reaction is
2 S2O32-(aq) + I3-(aq) S4O62-(aq) + 3 I-(aq).
A) 0.0833 M
B) 0.120 M
C) 0.167 M
D) 0.333 M
Question 2
If the concentration of OH- is 1 10-2 M, the concentration of H3O+ is ________ M.
A) 1 100
B) 1 10-2
C) 1 10-7
D) 1 10-12
E) 1 10-14
Question 3
Based on the balanced chemical equation shown below, what volume of 0.250 M K2S2O3(aq), is needed to completely react with 24.88 mL of 0.125 M KI3(aq), according to the chemical equation: 2 S2O32-(aq) + I3-(aq) S4O62-(aq) + 3 I-(aq).
A) 6.22 mL
B) 12.4 mL
C) 24.9 mL
D) 99.5 mL
Question 4
Calculate the frequency of the green light emitted by a hydrogen atom with a wavelength of 486.1 nm.
A) 1.46 1014 s-1
B) 6.86 1014 s-1
C) 4.33 1014 s-1
D) 6.17 1014 s-1
E) 1.62 1014 s-1
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