1. H

    Chemical equilibrium

    What is the minimum concentration of CN- that will prevent the precipitation of AgX(s) from a solution that is 0.149 M in X-(aq) and 0.0184 M in Ag+(aq)? (Ksp for AgX(s) = 5.2 × 10^-17; Kf for Ag(CN)2- = 5.6 × 10^18) I have no idea how to calculate this question My attempt: AgX(s) --> Ag+ +...
  2. J

    Carbonate equilibriums

    I'm stuck on the last part of an experiment regarding carbonate equilibriums. First, carbon dioxide gas was bubbled through Ca(OH)2. This produced a cloudy liquid, and then when the gas continued to bubble through, the liquid turned clear again. I'm fine with this part: Ca(OH)2(aq) + CO2(g)...
  3. A

    Chemical equilibrium problem help

    Hi everyone. I am from Sri Lanka. My university entrance exams are coming up. Need help figuring out past paper problems mainly physical chemisrty. Any advice?
  4. D


    Hello, I am having some issues with the following question. Thanks in advance! 1. [Ag(NH 3 ) 2 ] + is a type of ion called a complex ion. Consider the equilibrium: AgCl (s) + 2 NH 3(aq) :rarrow: [Ag(NH 3 ) 2 ] + (aq) + Cl¯ (aq) If the equilibrium will shift (highlight): Cl¯ is removed ← →...
  5. JasonHerbalExt

    what change will increase the quantity of CO(g) for the reaction at equilibrium?

    If the reaction is at equilibrium with excess C(s) remaining, what change will increase the quantity of CO(g) for the reaction at equilibrium? I Adding C(s) II Increasing the temperature III Increasing the pressure (A) I only (B) III only (C) I, II, and III (D) None of these
  6. JasonHerbalExt

    Which of the following is true about the equilibrium constant for this reaction?

    An endothermic reaction has a positive value for ∆S. Which of the following is true about the equilibrium constant for this reaction? (A) It may be greater than 1 only at low temperatures. (B) It may be greater than 1 only at high temperatures. (C) It is greater than 1 at all temperatures...
  7. L

    Some chemistry questions I need help with

    1. a)You put [H2] = 0,70M, [I2] = 0,70M and [HI] =1,50M. And the K value is 49. Decide the equilibrium concentrations. H2 + I2 <-> 2HI b) Which concentration HI gets inserted if the iodine concentration at a new equilibrium is 0,42Molar. The K value is still 49. c) What happens with the...
  8. A

    Equilibrium nearest-neighbor

    Hi, I have an advanced Chemistry problem that I have no idea where to begin. Here it is: Find the equilibrium nearest-neighbor of a linear chain of particles, alternatiely positive and negative, with pairwise interactions of the form: The interactions of a given particle with...
  9. S

    Equilibrium calculations

    Hi! Need help with this: In order to study the following reaction: NO+NO2+H2O ==> 2HNO2 a mixture of NO, NO2 and H2O was prepared in a 10.0 L glass bulb at 20*C with the following initial concentrations: [NO]=[NO2] = 2.9*10^-3 M [H2O] = 9.44*10^-4 M [HNO2] = 0.0 M When equilibrium was...
  10. A

    don't understand what is exchanging with what in this acid/base equilibrium

    NH4+ + H2O (kr) = (kf) NH3 + H3O+; the same reaction can be written as: NH4+ + HO- (kr) = (kf) NH3 + H2O; where (kf) - rate of forward reaction and (kr) - rate of reverse reaction. 1 Question. NH4+ or NH3 exchanging with H2O? If NH4+ is exchanging with H2O: NH4+ (k-1) =(k1) H2O, where (k1)...
  11. P

    Calculating Kc for equilibrium?

    Given the chemical equilibrium: H2 + ½ S2 ⇌ H2S If the amounts of H2, S2, & H2S at equilibrium are 2, 1 & 3 moles respectively in a 10.0L flask, calculate Kc for the reaction. Write the expression for Kc for the production of 4 moles of H2. ----------------------------- The way I...
  12. L

    Equilibrium Constant

    I have this question for an assignment for college and am completely stuck: "Lab measurements at 1000oC show that there are 0.12 mol of each of CO(g) and H2O(g), and 0.087 mole each of H2(g) and CO2(g) at equilibrium in a 1L container. Calculate the equilibrium constant for the reaction at...
  13. S

    Help with Equilibrium Lab Problem

    PLEASE READ THE INFO FIRST THEN HELP ANSWER MY QUESTION AT THE END THANKS. This lab consisted of two parts. The first part procedure : 1. Use a buret to transfer exactly 4.0 mL of 0.0025 M solution of Fe(NO3)3 (in 0.10 M HNO3) to a 100-mL volumetric flask. 2. Now obtain about 100 mL of...
  14. S

    equilibrium word problem

    H2S(g) <> 2H2(g) + S2(g) Kc = 2.4x10^-4 1.333 mol of hydrogen sulfide is placed in a 1.0L container at a constant temp. What is the concentration of H2 at equilibrium? I started by putting my values into an ICE table and then a mass action expression, but what I ended up with was...
  15. S

    Equilibrium concentrations and total pressure question.

    I understand about 90% of how to do this question. The only problem I'm having is understanding how volume comes into the calculations. My solution manual has it where; 0.186mol / 2.16L to find the initial concentration for H3CON and then volume is not brought into calculations of finding x...
  16. S

    Rate of Reaction, Activation energy and Equilibrium constant relations

    Rate of reaction - How fast a reaction goes to completion Activation energy - the amount of energy to get initiate a reaction EQC - Ratio of concentrations @ equilibrium (when the forward rate = reverse rate of reaction) Just needing some clarification on a certain example. "Because Ea is...
  17. W

    Given moles, reaction, and Kc, calculate equilibrium concent'n at a different volume

    For the reaction i2 + BR2 = 2IBr Kc= 280 Suppose that 0.460 mol IBr is allowed to reach equilibrium in a 2.00 L flask... 1. What is the equilibrium concentration of IBr? 2. What is the equilibrium concentration of I2? 3. What is the equilibrium concentration of Br2? I've seriously spent about...
  18. I

    Adding liquid on dynamic equilibrium

    Hi chemists! Just a small question... If I have established a closed system equilibrium between a vapor and liquid... then add some more liquid, what would happen? I thought there be more gas because the equilibrium shifts in a way such that: Liquid <---> Gas Producing more gas according to...
  19. P

    Thermodynamics Question: Finding Equilibrium Constant

    Calculate the standard free energy change for the combustion of methanol at 25 deg. C. 2 CH3OH(l) + 3 O2(g) -> 2 CO2(g) + 4 H2O(g) My answer was -1.37E3 kJ, which was right. Now the part I need some guidance on: If instead of the theoretical 2 mol, the actual reaction uses reaction...
  20. I

    finding ion concentrations of solution in equilibrium

    An excess amount of silver chloride is added to a beaker of 2 M sodium cyanide. Calculate the concentration of all ions, other than OH- and H+, that are in solution once the system reaches equilibrium. (Hint, there should be 5 other ions present) Please explain through your answer!! I'm really...