Equilibrium Questions and Answers

Normal a HBr aq b HClO4 aq c NH3 aq d H CO3 aq BIU X X EE fe

8 Given H 2 67 X 10 8 M calculate the following a OH 115

What is the OH in a solution that has a H 30 1 x 10 6 M 1 10 M 1 x 10 6 M 1 10 8 M 1 10 10 M 1 10 12 M

Consider the reaction N g 3H2 g 2NH3 8 AG f NH3 17 17kJ mol Determine the equilibrium constant for this reaction at 298 15K Hint Check the stoichiometry of the reaction when you use the Gibbs energy of format Report your answer as a whole number no places past the decimal point Do not use scientific notation

1 For the following reaction K 500 PCl3 g Cl2 g PCI5 9 What are the equilibrium concentrations if 0 75 mol of phosphorous trichloride and 0 75 mol of chlorine are pla an 8 0 L container

hich one of the following correctly shows the weak acid equilibrium for trichloroacetic acid CCI COOH A CCI COOH aq CCI CO aq OH aq B CCI COOH aq H O 1 CCI COOH aq OH aq C CCI COOH aq H O 1 CCI COO aq H O aq D CCI COOH aq H O 1 CCI CO OH aq H aq

P4 s 6 Cl2 g 4 PC13 1 If some phosphorus P4 is removed from the system then the equilibrium position would not be affected by such a change shift to the right in the direction of products shift to the left in the direction of reactants

pare the pH change when 0 04 mol NaOH is added to water vs when 0 04 mol NaOH is added to the buffer Based on this describe the benefit of a buf

8 Reactants and products of a neutralization a What are the reactants in a neutralization reaction reaction What are the products in a neutralization reaction b

Determine AG for the reaction 3 N g 2 O g 6 NO g at 223 C AH 257 7 kJ mol AS 213 7 J mol K 1 4 2 kJ m 3 O 5 6

Determine AG for 2 NO g N O g at 25 C Substance NO g N Oa g AG kJ mol 51 3 97 8 1 A 2 LO

6 Based on the definitions for strong acid and weak acid would you expect the concentration of an acid to play a role in determining if it s strong or weak Explain

What is the solubility in mol L of PbCl given that the Ksp is 4 76 10 10

What is the pH of a 0 64 M solution of NH Kb 1 2 105 3 answer has been submitted Choose Retry to change your ans

Using the formation constant Kf 1 1 x 107 calculate the equilibrium concentration of Ag in a 0 50 M solution of Ag NH3 2 Round to two decimal places Please circle the final answer

PCl3 g 3 NH3 g P NH2 3 g 3 HCI g If some P NH 3 g were removed from the system then the equilibrium position would Tap to Select Answer The result is that the amount of NH3 would Tap to Select Answer

Determine the value of Ksp for Mg CN 2 Initial M Change M Equilibrium M Based on the given values fill in the ICE table to determine concentrations of all reactants and products Mg CN s OTO 2 12 Mg aq NEXT 2 CN aq

Construct the expression for Ksp for solid ZnS in aqueous solution ZnS s Zn aq S aq 1 Based on your knowledge of how the solid will dissociate in aqueous solution use the tiles to form the expression

Determine the equilibrium constant for a reaction at 200 K if AG 26 3 kJ mol R 8 314 J mol K

In chemistry the pH of a solution is a measure of the acidity or alkalinity of a solution Water has a pH of 7 and in general acids have a pH less than 7 and alkaline solutions have a pH greater than 7 Find the pH of a solution with a hydronium ion concentration of 8 6 x 10 moles liter Round your answer to two decimal places If necessary Answer How to enter your answer opens in new window nH Correct Keypad Keyboard Shortcu

5 The ionic compound FeF2 has a Ksp of 2 4 x 10 at 25 C Complete parts a b below 12 pts a Write the chemical equation for solid FeF dissolving in water b If FeF2 is added to something other than pure water how will the solubility be affected In the table below circle your prediction for each of the scenarios listed When FeF is added to a solution containing 0 100 M Fe NO3 2 0 100 MHNO3 0 100 MLIOH The solubility of FeF2 will be greater than greater than greater than the solubility in pure water the same as the same as less than less than less than the same as 6 A buffer solution contains 0 170 moles of NH4Cl and 0 140 moles of NH3 in a total volume of 750 0 mL Complete parts a c below 16 pts a Calculate the pH of the buffer solution b Write the chemical equation for the reaction that occurs when an NaOH is added to the buffer solution c Calculate the pH of the buffer solution AFTER the addition of 0 030 moles of NaOH

For the following equilibrium ir Kap 4 4 x 10 10 what is the molar solubility of bismuth arsenate BIASO s Bi aq AsO aq Select the correct answer below 4 4 x 10 10 M O 3 1 x 10 M 5 28 x 10 M O 2 1 x 105 M

NO g 03 g NO2 g O2 g AH 199 kJ If the temperature of the system were decreased then the equilibrium position would Tap to Select Answer The result is that the amount of NO would Tap to Select Answer

H2 g F2 g 2 HF g If the pressure of the system were increased then the equilibrium position would not be affected by such a change shift to the right in the direction of products shift to the left in the direction of reactants

Which of the following is correct concerning the following system at equilibrium at 298 K AH 500 kJ mol K 1 x 10 10 A B C D A AG 0 B AG 0 C AGO 0 D The reaction is exothermic E This is a product favored reaction

6 A buffer solution contains 0 170 moles of NH4Cl and 0 140 moles of NH3 in a total volume of 750 0 mL Complete parts a c below 16 pts a Calculate the pH of the buffer solution b Write the chemical equation for the reaction that occurs when an NaOH is added to the buffer solution mola

Construct the expression for Ksp for solid Bil in aqueous solution Bi aq 3 l aq Bil s Ksp Based on your knowledge of how the solid will dissociate in aqueous solution use the tiles to form the expression 1

Which one of the following correctly shows the equilibrium for the weak base quinoline C H N A C H N aq 2 H O I CH NH aq 2 OH aq B C H N aq H O 1 C H NH aq OH aq C C H N aq H O CH N aq H O aq D C H N aq H O I C H NO aq H O aq

What is the solubility of La 10 in water Ksp of La 10 is 7 5 10 12

Zn s 1 0 M Zn NO3 2 aq KNO3 aq salt bridge B V The standard reduction potentials for the half reactions related to the galvanic cell represented above are listed in the table be Half Reaction Cr aq 3 e Cr s Zn aq 2e Zn s Which of the following gives the value of E cell for the cell E cell 1 50 V E cell 0 80 V 1 0 M Cr NO3 3 aq Excell 0 02 V Cr s E V 0 74 0 76

The solubility of Ni PO in water at a particular temperature is 8 0 104 M What is Ksp for Ni PO

a Identify three physica b Identify three chemic

The following information is given for silicon at 1 atm To 2355 00 C Tm 1410 00 C Specific heat solid 0 7110 J g C Specific heat liquid 0 9080 J g C AHvap 2355 00 C 1 058 x 10 J g AHfus 1410 00 C 1 653 10 J g A 33 70 g sample of solid silicon is initially at 1387 00 C If 4 308 104 J of heat are added to the sample at constant press P 1 atm which of the following is are true Select all that apply O The sample is a liquid The sample is at a temperature greater than 1410 00 C O The sample is a gas The sample is at a temperature of 1410 00 C The sample is a solid in equilibrium with liquid

4 1 point Evaporating salt water in the sun to obtain the salt Is this an endothermic or exothermic process Exothermic Endothermic

2 SO3 g 2 SO2 g O2 g If the pressure of the system were increased then the equilibrium position would Tap to Select Answer The result is that the amount of SO3 would Tap to Select Answer

Interpreting pH pH 5 0 pH 10 6 pH 13 0 pH 2 3 a Which of the solutions are acidic Which of the solutions are alkaline b c Which of the solutions has the most hydrogen ions Which of the solutions has the most hydroxide ions d

To a 25 00 mL volumetric flask a lab technician adds a 0 175 g sample of a weak monoprotic acid HA and dilutes to the mark with distilled water The technician then titrates this weak acid solution with 0 0889 M KOH She reaches the endpoint after adding 48 83 mL of the KOH solution Determine the number of moles of the weak acid in the solution moles of weak acid Determine the molar mass of the weak acid molar mass pK 4 34 X10 3 5 94 Incorrect 40 31 After the technician adds 18 23 mL of the KOH solution the pH of the mixture is 5 51 Determine the pK of the weak acid mol g mol

Consider the reaction ICI g Cl g ICI s The AG of the reaction is 17 09 kJ mol Calculate the Keq for the reaction at 298 0 K

n Reaction Specifically explain how the salt is formed neutralization reaction

What is the pH of a 0 52 M solution of HN Ka 1 9 10 5 X

in the blanks below with the correct term for the solution outside the cell isotonic hypertonic or hypotonic The pictures show a red blood cell in 3 different solutions water moves RBC 2 NaCl or 11 glucose Pure water tonic L tonic equal 0 85 NaC1 or 5 3 Glucose tonic 5 You will be putting your 0 50 M solution into dialysis tubing to simulate a cell and then placing that model cell into tap water Explain your prediction of what will happen to your model cell after 20 minutes in the tap water Use a diagram to illustrate your explanation

Identify the point s on the following diagram where the addition of heat will cause some of the sample to melt Temperature C E D F Heat Energy G H FD1

A chemist dissolves 748 mg of pure hydrochloric acid in enough water to make up 360 mL of solution Calculate the pH of the solution Round your answer to 3 significant decimal places 11

For each of the indicators below list th results when placed into an acid b substance a Red Litmus Paper b Blue Litmus Paper c pH Paper d Phenolphthalein

7 HASO can act as both an acid and a base Is it better at being an acid or a base Include enough work and or explanation to support your answer 8 pts

Strong base is dissolved in 755 mL of 0 600 M weak acid K 3 34 x 10 5 M to make a buffer with a pH of 3 92 Assume that the volume remains constant when the base is added HA aq OH aq H O 1 A aq Calculate the pK value of the acid and determine the number of moles of acid initially present pk 4 48 moles of weak acid A HA When the reaction is complete what is the concentration ratio of conjugate base to acid 0 255 1 25 Incorrect Incorrect How many moles of strong base were initially added 0 253 mol HA

2 H O 1 2 H g 2 H2 g O2 g If additional hydrogen H is added to the system then the equilibrium position would not be affected by such a change shift to the right in the direction of products shift to the left in the direction of reactants

PH 4 70 8 00 4 325 H M 7 70 X 10 M 3 24 x 10 3 OMH in 8 OH M 2 30 X 10 8 M POH 3 60 oyles planta clur pou and thieu QMH 1 09 x 10 10 M HOT Is it an ACID or a BASE 11 76 Hq Jap orauzen Sbris Tzas 2 vigaludu qa

A pH value of less than solution Equations pH log H is an acidic solution A pH of more than is 1229584 H 10pH Practice Problems Show all work and circle your final answer ven PHof 2 90 nd H 1 Calculate the H concentration if the pH of lemon juice 2 90

What is the pH of a 0 308 M weak base solution The K of the weak base is 0 000090