if you have time can you help me #2 a b and c also? Homework Set #2 CHE-100 Igno
ID: 474635 • Letter: I
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if you have time can you help me #2 a b and c also?
Homework Set #2 CHE-100 Ignore all activity coefficients Due: January 17, 2017 1) You measure a concentration of dissolved s spring and the phases a) What pH and the near a hot kg. listed in is the equilibrium silica concentration is 4.9.10 moles the state of this water with respect to the five silica mineral b) Is this a K or QIK problem? 2) What is the pH of a 0.01 m solution of sodium acetate? Acetic acid is monoprotic with an equilibrium like: HAc H* Ac al (HAc) You can assume that the sodium dissociates completely from the acetate and is not involved in any other important reactions. a) Is this a conjugate base or an acid that you are adding to solution? b) Write down the Mass-Balance Relations, the Proton Balance Relation and the Equilibrium Relations. c) Calculate the pH using both an analytic method, and by drawing the predominance diagram. 3) Sulfide can form hydrosulfidic acid (H saa hinulouExplanation / Answer
H4SiO4 <-->H+ +H3SiO4^-
H3SiO4^- <--->H+ + H2SiO4^2-
H2SiO4^2- <--->H+ +HSiO4^3-
HSiO4^3- <--->H+ +SiO4^2-
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H4SiO4 <---> 4H+ + SiO4^2- [net equation]
b) equilibrium constant =K=[H+]^4 [SiO4^2-]/[H4SiO4]
pH=-log [H+]
As the solution has a constant pH ,so silica is in equilibrium state dissolved in water so this is a case of K not Q
Q=reaction quotient ,when the reaction is not in equilibrium
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