Equilibrium Questions and Answers

Which of the following would dissolve Pb OH 2 more than pure water A Buffer solution having pH 6 C 0 01 M NH4OH solution B 0 01 M PbCl2 solution D All of the above

If the pressure on the equilibrium system Nagi Ozgi A the quantity of N2 g decreases C the quantity of NO g decreases B the quantity of NO g increases D the quantities in the system do not change The quantity of Oag decreases The quantities in the system do not change The quantity of Oag increases The quantity of Nag decreases The quantity of NO increases The quantity of Nag increases The quantity of NO decreases H 2NO g decreases what happens Mark all that apply

Predict the equilibrium concentration of O in the reaction described below by constructing an equilibrium expression for Qc constructing an ICE table writing an equilibrium expression for Kc and solving for the equilibrium concentration Complete Parts 1 4 before submitting your answer N g O g 2 NO g NEXT In a 1 0 L container at high temperature 0 20 mol N and 0 15 mol O are allowed to react Set up the expression for Qc Each reaction participant must be represented by one tile Do not combine terms Once the expression is constructed solve for Qc to determine the direction of the reaction Qc 2 3 4

Some aqueous solutions are given below Find the solution whose pH changes maximum by adding 10 millimoles amount of pure H SO4 100 mL 0 1 M HCI 100 mL 0 5 M Ca OH 2 O 100 mL 0 1 M Ca OH 2 100 mL 0 4 M H S 100 mL 0 1 M NaOH 100 mL 0 2 M K SO4 O 100 mL 0 5 M CH3COOH 100 mL 0 1 M Ba OH 2

A mixture of 0 100 mol CO2 0 0500 mol H2 and 0 100 mol H2O are place in a 1 00 L flask and allowed to come to equilibrium as shown below At equilibrium CO2 0 0954 M CO2 g H2 g CO g H2O g a What are the equilibrium concentrations of H2 CO and H2O

Hydrogen gas reacts with oxygen gas to produce water as shown below 2H2 O2 2H O Approximately how many grams of hydrogen gas are needed to completely react with 128 grams of oxygen gas 31 68 g H2 8 08 g H2 O 16 16 g H2 30 68 g H

In the atmosphere the concentration of N is 0 033 M and the concentration of O is 0 00810 M at 25 C Suppose the concentration of NO g in the atmosphere is 1 13 10 7 M at 25 C What is the equilibrium constant for this reaction at 25 C Type the correct answer in the box Express your answer to two significant figures Keq x 10 31

The image shows a small volume within a 1 0 L solution with a solute concentration of 1 M The blue spheres represent the solute particles in the solution Identify whether you would need to add more solute or more solvent to the solution to achieve each of the following solutions Each image represents the same small volume within the solution Add solute Add solvent

Solubility g in 100g water 100 80 60 40 20 0 10 20 30 40 50 Temperature C 60 70 B A 80 D Creative Commons license Wikipedia https commons wikimedia org wiki File Solubility curve jpg In 400 g of water at 50 degrees Celsius approximately what mass of substance C will

If the pOH of a solution is 3 3 then the pH is Select solution is Select and the

A student adds a small amount of phenolphthalein to an erlenmeyer flask and it changes to pink when he adds the base sodium hydroxide What is phenolphthalein considered to be O an indicator O a titrant an analyte O a quotient

3 Two reactions have similar AHrn values AH xn 1 AH xn 2 but reaction 1 has a much smaller standard entropy change than reaction 2 AS rxn 1 AS rxn 2 At 298 K which statements about these two reactions must be correct I II Reaction 1 must have a larger equilibrium constant Keq 1 Keq 2 Reaction 1 must have a larger Arrhenius prefactor A1 A 2 A I only C Both I and II B II only D Neither I nor II

he hydrogen ion concentration of a basic solution is 8 80 x 10 11 M What is the pH of the solution

2 Label each property as either Acid Base or Salt a pH of 7 14 b Feel slippery e HCI i Used in cleaning agents f Taste sour j Proton donor c pH of 7 g MgCl k Taste bitter d NaOH h pH less than 7 1 Proton acceptor

5 In a titration a 25 0 mL sample of 0 150 M HCl is neutralized with 44 45 mL of Ba OH 2 a Write the balanced molecular equation for this reaction b What is the molarity of the base solution

Which of the following best models a weak acid in aqueous solution Water molecules are not included