Equilibrium Questions and Answers

A 1 0 L flask is filled with NO and O initially After the reaction establishes equilibrium the flask is found to contain 0 0018 mol NO 0 0012 mol O and 0 78 mol NO2 What is the value of the equilibrium constant Kc at this temperature 2NO g O g 2NO g 4 A 6 3x10 9 B 2 8x10 6 C 3 6 105 D 16x108

Oxygen and ozone are allowed to come to equilibrium in the exothermic reaction 20 g 30 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 Dincreasing the volume of the container

At 22 C an excess amount of a generic metal hydroxide M OH is mixed with pure water The resulting equilibrium solution has a pH of 10 42 What is the Ksp of the salt at 22 C Ksp

Write the equation for Keq for the following as a homogeneous equilibrium only the aqueous phase Complete the reaction Al OH 3 s Al aq Calculate the Ksp for Al OH 3 s which is only slightly soluble in water if a saturated solution contains Al 0 110 M and OH 0 330 M Ksp Keq X Ksp the concentration of OH is cubed because its coefficient is 3 a acetic b hydrochloric d Al 3 g HF aq h CaCO3 s k SO4 n HPO42 0 H PO4 p CO 2 r H S c phosphoric i OH 1 J H30 q HCO3 1 e CO 1 Mg2 S HS1 f CaF2 aq m cH1 t S 2 E

A solution contains 0 23 M Pb2 and 0 45 M A1 Calculate the pH range that would allow Al OH 3 to precipitate but not Pb OH 2 The Ksp values for Al OH 3 and Pb OH 2 can be found in this table minimum pH maxiumum pH

Calculate the Ka for a monoprotic acid HX if a 0 100000 M solution has a pH of 3 333 The data is provided If it wasn t you could get the concentrations by converting the pH into H30 using H3O 1 10PH 103 333 start equil Ka Ka HX 0 100000 M 0 099536 M 0 000464 M H O The stoichiometry tells us that if we made 0 000464 mol of H30 we also made The amount of HX at equilibrium is 0 100000 M HX H O 0 0 0 000464 M 0 000464 M X MX mol of X1 M HX 4

If a 1 0 L flask at equilibrium contains 0 22 mol of N 0 22 mol of O2 and 0 070 mol NO at 2000 C what is the value of the equilibrium constant Kc N2 g O g 2NO g A 21 B 10 C 0 10 D 0 048

voltaic cell is constructed that is based on the llowing reaction n aq Pb s Sn s Pb aq Part A If the concentration of Sn in the cathode compartment is 1 20 M and the cell generates an emf of 0 17 V what is the concentration of Pb2 in the anode compartment Express your answer using two significant figures Pb Submit Part B AEO Request Answer AEO If the anode compartment contains SO 1 40 M in equilibrium with PbSO4 s what is the Kp of PbSO4 Express your answer using two significant figures M

The formation constant of M CN 4 2 is 7 70 x 10 6 where M is a generic metal A 0 170 mole quantity of M NO3 2 is added to a liter of 1 150 M NaCN solution What is the concentration of M2 ions at equilibrium M

Write the expression for the Ka for each of the following reactions H CO3 H O H30 1 HCO3 Ka H CO3 2 H O 2H30 1 CO3 1 Ka c phosphoric h hydrosulfuric i OH 0 H PO3 p CO3 q HCO3 a acetic b hydrochloric g sulfurous n HPO32 4 H O M H CO d perchloric j H30 r H S k SO4 e hydrofluoric 1 Mg 2 S HS 1 t 5 2 f sul m Cl 1

0 of 1 point earned 3 attempts remaining If a chemical reaction has a positive AH and a negative AS then 0 of 1 point earned 3 attempts remaining What is the plaf M

Use the reaction below to answer the question PC 5 g PC 3 g Cl g Cl g AH 67kJ mol If the reaction is at equilibrium and a scientist decreases the pressure of the reaction container what will happen The reaction will shift to the left The amount of Cl2 will decrease The amount of PC15 will Increase The reaction will shift to the right The amount of PC13 will decrease

What are the Br nsted Lowry bases in this reaction NH3 aq H O l NH4 aq OH aq A NH3 and OH B H O and NH4 C NH3 and H O D NH4 and OH

What is the pH of a 0 35 M solution of CH3 3N Kb 7 4 x trimethylamine 10 s5

The Ksp of lead II carbonate PbCO3 is 7 40 x 10 4 Calculate the molar solubility S of this compound S M

The base protonation constant K of allantoin C H4N3O3NH is 9 12 10 Calculate the pH of a 0 32 M solution of allantoin at 25 C Round your answer to 1 decimal plac pH X S

8 The base protonation constant K of lidocaine C14H21 NONH is 1 15 x 10 Calculate the pH of a 1 3 M solution of lidocaine at 25 C Round your answer to 1 decimal place pH 0 X S

The base protonation constant K of allantoin C4H N O NH is 9 12 10 X Calculate the pH of a 0 32 M solution of allantoin at 25 C Round your answer to 1 decimal place pH X S

Use the equation pH log H where H is the hydrogen lon concentration of a solution Peanuts grow best in soils that have a pH between 5 3 and 6 6 What is the range of hydrogen ion concentrations for these soils Enter your answers in scientific notation Round your answers to one decimal place The lower boundary of the range is Need Help Read It x 10 F and the upper boundary of the range is x 10

What are the signs of AGsys AHsys and ASsys respectively for the condensation of water at 110 C H O g H O 1

What must the concentration of the base be Target pH 2 42 Acid Base pair H3PO4 NaH PO4 pk 2 12 NaH PO4 H3PO4 H3PO4 0 100 M 9 80 g H3PO4 required base acid 2 00 NaH PO4 1 Recheck 5th attempt XM Next 5 of 6 Show Approach

40 2 points In the reaction below what what are the physical states of the two substances 0 O O O O 03 aqueous and liquid gas and solid gas and gas gas and liquid Previous

8 OH 1 0 x 104 What is the pH 9 What is the hydronium ion concentration H3O when the hydroxide ion concentration OH 1 0 x 10 3 10 If 20 mL of 1 0 M HCI is used completely to neutralize 40 mL of an NaOH solution what is the molarity of the NaOH solution 11 A solution measures a pH 10 Phenolphthalein indicator would be clear pink and litmus paper indicator would be red blue

4 Find the missing values H M a 3 2 X 104 M b c d e 3 80 X 106 M f 09 h i 5 X 10 2 M j OH M 6 7 X 10 M 9 42 X 10 10 M 2 2 8 X 10 M pOH 3 42 11 7325 pH 6 81 1 2

2 NO g N g O g N g Br g O g 2 NOBr g Calculate the value of K for the reaction NO g N g 02 9 m 1 x 10 0 2 x 103 4 x 10 14 x 1015 one of these K 1 x 10 2 K 2x10 7

Which reactions are involved in determining equilibrium O Reverse reaction O Both of the above O Neither of the above O Forward reaction

Calculate and select the pOH of a 0 225 M solution of N2H4 aq hydrazine a weak base if the percent hydrolysis was found to be 0 1868

1 A catalyst increases decreases the rate of a reaction by raising lowering the activation energy 2 Name four ways that you can increase the rate of the reaction between calcium and hydrochloric acid 3 If the equilibrium constant K 100 this reaction favors the reactants products and proceeds very little almost to completion

Q55 Nickel carbonate is being precipitated out of a 1 00 L solution If the concentration of dissolved nickel is 0 248 what mass in micrograms of sodium carbonate Na CO3 must be added for precipitation to begin The Ksp of nickel carbonate is 1 42 x 10 7 1 gram 1 x 106 micrograms g

3H g N 9 2 NH g heat 6 Write the equilibrium expression 7 Given the following concentrations NH 1 M H 6 M and N 1 5 M what is the value of the equilibrium constant K 8 If the temperature is increased the reaction will shift to the left right increasing reactants products 9 If the pressure is increased the reaction will shift to the left right increasing reactants products 10 If the amount of NH3 is decreased the reaction will shift to the left right increasing reactants products

20 2 points A solution whose H 8 0 10 8 would be acidic basic neutral Previous

Solute per 100 g of H O g 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 0 Table G Solubility Curves KI NaNO3 HCI SO KNO3 NH C KCI KCIO3 NaCl NH3 10 20 30 40 50 60 70 80 90 100 Temperature C

1 2 4 22 2 points A solution with a pOH of 2 will be more acidic than one with a pOH of 1 True False Previous

When 25 0 mL of a 5 75 10 4 M silver fluoride solution is combined with 12 0 mL of a 9 14 10 4 M potassium iodide solution does a precipitate form yes or no For these conditions the Reaction Quotient Q is equal to

CHAPTER 10 ACIDS AND BASES 10 11 The OH of a solution is 3 6 x 10 4M What is the corresponding H O A B C D 3 6 1010 M 2 8 10 10 M 2 8 10 11 M 3 6 10 M

Calculate the solubility at 25 C of PbCrO4 in pure water and in a 0 0120M Na CrO4 solution You ll find Kp data in the ALEKS Data ta Round both of your answers to 2 significant digits solubility in pure water solubility in 0 0120 M Na CrO4 solution 0 09 0 H x10 X 00

2 points Ions which are present in a chemical reaction but do not take part in the reaction are called bystander ions onlooker ions non participating ions spectator ions Previous

Consider a substance with a melting point of 176 K If this substance is in a container at 115 K what will the value be for ASuniv for the process of melting this substance in k AHrus 239 kl mol

1 2 3 17 2 points Cabbage juice would be acidic neutral O basic Previous

Question 2 of 11 Predict the product s of this reaction Don t worry about balancing the equation Pb NO3 2 KI 4 points A PbK s INO3 aq B PbI s KNO3 aq OC PbI aq KNO3 s D No Reaction

0 10 M 0 30 M 3 5 M 2 SO g 0 g 2503 9 The Keq for the above reaction is 4 3 Determine the absolute value difference between Q and K and make a determination if the reaction will proceed favoring reactants or products and how pressure will be affected 4079 03 favor products pressure decrease 112 47 favor reactants pressure increase 4079 03 favor reactants pressure increase 2 45 x 10 4 favore products pressure decrease

6 Given the following reaction 3 H g N g Fill in the following chart please use a different font color Changes Stress on Reason for shift system Ex Adding H Adding NH3 Decreasing the pressure Adding heat Removing N Increasing the pressure Direction of shift left or right right 2 NH g heat To decrease excess H and increase NH

Use the editor to format your answer Question 2 1 Point If a solution contained a substance of 4 67kg molar mass of 34 6 g mol in 350mL what is the molarity of the solution I Use the editor to format your answer

017 10 0 points A 1 000 L vessel is filled with 1 000 mole of N2 2 000 moles of H and 3 000 moles of NH3 When the reaction N g 3H g 2 NH3 g comes to equilibrium it is observed that the concentration of NH3 is 1 93 moles L What is the numerical value of the equilibrium con stant Ke

Given the following reaction 2 HCl aq Mg s MgCl aq H g heat When the temperature is decreased what changes occur O In order to restore equilibrium the reaction shifts right towards reactants In order to restore equilbrium the reaction shifts left towards products O In order to restore equilibrium the reaction shifts left towards reactants O In order to restore equilibrium the reaction shifts right towards products

O 3 M HCL O 1 0 x 102 M HCL Question 18 If MOH is a generic base then what will be its conjugate acid O MOH O MOH

The pH of a 1 0 x 10 5 M H3O solution is O 5 00 acidic 5 00 acidic O 1 00 acidic 1 00 neutral and the solution

9 For each of the following solve for H3O OH pH and determine if the solution is acidic basic or neutral The symbol H3O represents the molarity of H O in solution Significant figures automatically graded based on entered given data or previous calculation a b C d a H3O 0 38 1 45 x 10 5 0 046 OH 0 0045 4 20 x 10 10 pH 4 84 9 5 Acidic Basic or Neutral Choose Base Choose Choose Choose Acid Choose Choose Choose Base

1 he reaction AB2C g B g AC g reached equilibrium at 900 K in a 3 00 L vessel At equilibrium 0 0570 mol of AB C 0 0100 mol of B2 and 0 0590 mol of AC were detected What is the equilibrium constant at this temperature for this system

Ruth is trying to determine if some household substances are acids or bases She collects the following data Household Substances Data ID of Substance pH Lemons Tomato juice Tap water Baking soda Soapy water Drain cleaner 13 4 Which household substance test by Ruth is a weak base B C 2 3 4 3 7 2 9 1 10 0 D drain cleaner tomato juice soap baking soda Answered Inca