Equilibrium Questions and Answers

b O c O d Oe removing some SO2 g removing some O2 g adding some O2 g increasing the temperature What is the pH of a 7 4x10 M aqueous solution of KOH at 25 C Record your answer to decimal places What is the coniugate acid of NO3

1 e 1 23E4 An evacuated i e empty vessel is charged with 0 104 atm of SO3 g and 0 104 atm of CO g The following reaction proceeds to reach equilibrium Report your answer to 3 significant figures Time left 1 28 42 SO3 g CO SO g CO g The equilibrium constant for this reaction at this temperature is Kp 0 0781 What is the pressure of carbon dioxide in this system at equilibrium atm

At a certain temperature silver bromide AgBr has a value of Kp 6 5 x 10 13 At this temperature what is the molar solubility of AgBr in the presence of 0 0044 M HBr Report your answer to two significant figures i e 1 2E 10 M Answer In which of the following aqueous solutions would you expect AgCl to have the lowest solubility Select one O a pure water O b 0 020 M KNO3 Oc 0 020 M KCI O d 0 130 M NaCl Oe 0 025 M AgNO3

Select one a O b Ni aq pb s O d Ni s C Pb aq Answer cell 0 295 V At 25 C what is AGO for this A galvanic cell is prepared based on a 4 electron process with E reaction Please list your answer in units of J mol Write your answer with three significant figures

For a certain chemical reaction Qc 3 and Kc 3 Under these conditions which of the following is true For full credit mark all that are true and none that are false Select one or more AG 0 AG 0 AG 0 AGO 0 AGO 0 AGO 0

Consider the following reaction at equilibrium 2 H O g Cl g O g 4 HCI g AH 114 kJ How will the system respond if an equilibrium mixture is cooled Select one O a the system will remain at equilibrium O b the system will shift right producing more O and HCI O C the system will shift left producing more H O and Cl O d the partial pressures of H O and HCI will go up while those of Cl and O will go down What is the pH of a 4 97x10 4 M aqueous solution of HCIO4 at 25 C

The reaction A g 2B g has a value of Kp 1 301 If the reaction is initiated with 3 0 atm of gas A and 3 0 atm of gas B which direction will the reaction proceed to reach equilibrium Select one O a the pressure of all gasses will increase O b the system is already at equilibrium O c to the left creating more reactant O d to the right creating more product e the pressure of all gasses will decrease

O b H SO3 O c H TeO4 O d H SO4 O e H SO4 Calculate the pH of a 0 0316 M solution of anisic acid The K of anisic acid 3 2 x 10 5 Write your answer to 2 decimal places Answer a ad values Pay attention to significar

e The value of Ke for the following reaction is 0 07 3SO3 g 3NO g 3SO2 g 3NO2 g The value of Ke at the same temperature for the reaction below is SO2 g NO2 g SO3 g NO g

An evacuated i e empty vessel is charged with 92 8 atm of NH3 g The following reaction proceeds to reach equilibrium 2NH3 9 N g 3H g At equilibrium the partial pressure of H remains constant at 60 8 atm The value of Kp is Report your answer to 3 significant figures Use scientific notation i e 1 23E4

A gas that has a volume of 18 liters a temperature of 35 C and an unknown pressure has its volume increased to 49 liters and its temperature decreased to 25 C If I measure the pressure after the change to be 2 0 atm what was the original pressure of the gas

Fill in the missing chemical formulae in the tables below acid NH HCIOA H O conjugate base 0 base H O OH NH conjugate acid C X

Calculate the solubility at 25 C of CaF2 in pure water and in a 0 0030 M NaF solution You ll find Ksp data in the ALEKS Data tab Round both of your answers to 2 significant digits solubility in pure water solubility in 0 0030 M NaF solution 0 0 00 x10 00

Calculate the solubility of Mg OH in water at 25 C You ll find K data in the ALEKS Data tab Round your answer to 2 significant digits

An aqueous solution at 25 C has a OH concentration of 1 5x 10 M Calculate the H O concentration Be sure your answer has the correct number of significant digits OM

Write the concentration equilibrium constant expression for this reaction 2 Cu aq 2 Ag s Cu s 2 Ag aq E

The acid dissociation constant K of carbonic acid H CO3 is 4 5 10 7 Calculate the pH of a 6 5 M solution of carbonic acid Round your answer to 1 decimal place pH 0 X

A chemist dissolves 280 mg of pure potassium hydroxide in enough water to make up 100 mL of solution Calculate the pH of the solution The temperature of the solution is 25 C Be sure your answer has the correct number of significant digits 0 Do x10

Methane and water react to form hydrogen and carbon monoxide like this CH g H O g 3 H g CO g The reaction is endothermic Suppose a mixture of CH4 H O H and CO has come to equilibrium in a closed reaction vessel Predict what change if any perturbations in the table below will cause in the composition of the mixture in the vessel Also decide whether the equilibrium shifts to the right or left perturbation change in composition The temperature is raised The pressure of H O will The temperature is lowered The pressure of H will shift in equilibrium to the right O to the left O none to the right to the left O none

An aqueous solution at 25 C has a OH concentration of 0 004 M Calculate the H O concentration Be sure your answer has the correct number of significant digits M O x10

Mercury II oxide decomposes to form mercury and oxygen like this 2 HgO s 2 Hg 1 O g At a certain temperature a chemist finds that a 3 4 L reaction vessel containing a mixture of mercury II oxide mercury and oxygen at equilibrium has the following composition compound amount HgO 16 2 g Hg 16 6 g 0 17 2 g Calculate the value of the equilibrium constant K for this reaction Round your answer to 2 significant digits K x10

Some measurements of the initial rate of a certain reaction are given in the table below N H initial rate of reaction 0 183 M 1 02 M 0 0756 M S 0 0880 M 1 02 M 0 0175 M s 0 183 M 3 73 M 0 276 M s Use this information to write a rate law for this reaction and calculate the value of the rate constant k Round your value for the rate constant to 3 significant digits Also be sure your answer has the correct unit symbol rate k0 k 0 x10 00

Write the equilibrium constant expression for this reaction 2H aq C 0 aq 4 H C O4 aq

Nitrogen and water react to form nitrogen monoxide and hydrogen like this N g 2 H O g 2NO g 2 H g Write the pressure equilibrium constant expression for this reaction OC

An evacuated i e empty vessel is charged with 0 113M of HI g The followin reaction proceeds to reach equilibrium 2HI g H2 g 12 g The equilibrium constant for this reaction at this temperature is Kc 0 113 What is the concentration of hydrogen gas in this system at equilibrium Report your answer to 3 significant figures M 20

The equilibrium expression for Kp for the reaction below is 203 g 302 g Select one O a 3PO2 2PO3 O b 3PO3 2PO2 O c 2PO3 3PO2 O d PO 3 PO3 O e PO32 PO

The value of Kp for the equilibrium H2 g 12 g 2HI g is 61 6 at 427 C What is the value of Kp at the same temperature for th equilibrium below HI g 1 2 H2 g 1 2 12 g Write your answer as 1 23E 1

EXAMPLE A 0 10 M solution of sodium propionate has a pH of 9 What is the

Milk has a pH of 6 0 and household ammonia has a pH of 12 0 How much mo acidic is milk than ammonia 2 marks

0 250 M potassium sulfate K SO4 a soluble salt Use ICE Table

According to LeChatelier s principle removing NH causes the system to shift in the direction of NH4 aq H2O NH3 aq H3O aq Oboth products and reactants O products O not enough information Oreactants Ono change

What is the H3O in a solution with OH 1 x 10 6 M 0 1 x 105 M 1 x 10 23 M 0 1 x 105 M 1x 10 M 1x 108 M

I am learning about solution concentration Can I calculate the concentration of a solution based on molarity I am learning to evaluate the strength of acids and bases Can I calculate the percent dissociation of an acid and a base Can I use a mathematical model of the pH scale to evaluate the strength of acids and bases Can I explain conceptually how pH is related to hydrogen ion concentration CCC Scale proportion and quantity SEP Using mathematics and computational thinking Describe each of the following solutions Find the concentration of all species Determine the dissociation Use ICE Table with the Problems 0 0010 M solution of barium hydroxide Ba OH a strong base Find the pH and pOH if an acid or base

The concentrations of A B and C for the reaction A g B g C g are measured at several different temperatures At which temperature is the equilibrium constant the largest A B C D OC A B C T A 0 90 M B 0 30 M C 0 30 M T A 0 10 B 0 10 M C 0 10 M T3 A 0 30 M B 0 30 M C 0 30 M none of the above the equilibrium constant is the same at all three temperatures

What is the molar solubility of BaSO4 For BaSO4 Ksp 1 07 10 A B C D OC 1 14 10 20 M 1 03 x 10 5 M 2 14 x 10 10 M 1 07 10 10 M B OA C

Consider the reaction H g 12 g 2HI g Which change would cause the reaction to shift to the right toward the products increasing the concentration of hydrogen gas decreasing the volume increasing the volume O decreasing the concentration of hydrogen gas

The equilibrium constants at a fixed temperature for several reactions are listed here Which equilibrium constant indicates a reaction that is favored in the reverse direction A B C D OA OB C SOD Keq 1 0 10 2 Keq 1 0 10 Keq 1 0 none of the above

What is the effect of decreasing the pressure of a reaction mixture at equilibrium if the reactant side has fewer moles of gas particles than the product side The reaction will proceed in the forward right direction The reaction will proceed in the reverse left direction The reaction will stay at equilibrium

A sample of argon gas at a pressure of 0 932 atm and a temperature of 149 C occupies a volume of 426 mL If the gas is heated at constant pressure until its volume is 664 mL the temperature of the gas sample will be C

8 96 What volume of 0 2000 M KOH is required to titrate 25 00 mL of 0 1500 M HNO3

8 64 Calculate H3O for a solution of hydrochloric acid for which a pH 2 00 b pH 3 00

An evacuated i e empty vessel is charged with 117 8 atm of SO3 g The following reaction proceeds to reach equilbrium 2SO3 g 2 SO2 g O2 g At equilbrium the partial pressure of O remains constant at 0 46 atm The value of Kp is Write your answer to 3 sig figs ie 1 23E1

The reaction 2A B has a value of Kp 0 371 If the reaction is initiated with 3 0 atm of gas A and 1 0 atm of gas B which direction will the reaction proceed to reach equilibrium Select one O a the pressure of all gasses will decrease O b the system is already at equilibrium O c to the right creating more product O d the pressure of all gasses will increase to the left creating more reactant e

Flag question An evacuated i e empty vessel is charged with 15 30 atm of N g and 24 3 atm of H2 g The following reaction proceeds to reach equilibrium N2 g 3H2 g 2NH3 g At equilibrium the partial pressure of NH3 remains constant at 0 383 atm The value of Kp is Write your answer to 3 sig figs ie 1 23E1

nts Flag question What is the pH of an aqueous solution at 25 C in which the OH is 0 0065 M Write your answer as 1 23 Answer Question 22 Not yet answered Points out of 1 00 PFlag question Calculate the pH of a 0 068 M solution of acrylic acid The K of acrylic acid 5 3 x 10 5 Write your answer to 2 decimal places k

Consider the following reaction at equilibrium AH 514kJ 2CO2 g 2CO g O2 g Le Chateliers Principle predicts that the equilibrium partial pressure of CO g can be maximized by carrying out the reaction Select one a at high temperature and high pressure b in the presence of a solid carbon catalyst at low temperature and high pressure d at low temperature and low pressure e at high temperature and low pressure

Combining 1 0 mol of aniline C6H5NH2 with 0 5 mol of in 1 0 L of water will produce a buffer solution Select one a NH3 b HCI c more than one of these d NaCl e none of these

4 In a 0 080 M NH3 solution what percent of the ammonia is present as NH4 Ka NH4 5 6 10 10

Use the solubility graph to answer the following questions Solubility g of salt in 100 g H O 88888889 100 90 80 70 80 50 40 30 20 10 NANO CaCl NOC PHNOJ KC KCIOS K Cr O Ce SO 10 20 30 40 50 60 70 80 90 100 Temperature C 1 How many grams of potassium chlorate KCIO3 are needed to make a saturated solution at 90 C 2 How many grams of potassium chloride KCI can be dissolved in 68 0 g of water at 40 C 3 75 grams of calcium chloride is added to 100 g of water at 25 C Is the solutions unsaturated saturated or supersaturated 4 Based on the graph above cerium sulfate Ce SO4 3 behaves like a substance that is in what physical state Explain how you know 5 10 0 g of KCl are dissolved at 40 C How many more grams should be added to make a saturated solution

me to equilibrium in the exothermic reaction 203 g 302 g Which change will increase the numerical value of the equilibrium constant K A adding more O g B adding a suitable catalyst C decreasing the temperature D increasing the volume of the container