Suppose a solution contains 0.22 M Pb2 and 0.49 M Al3 . 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 here.

SO3(g) + NO(g) NO2(g) + SO2(g) Kc was found to be 0.500 at a certain temperature. A reaction mixture is prepared in which 0.375 mol NO2 and 0.375 mol of SO2 are placed in a 4.00 L vessel. After the system reaches equilibrium what will be the equilibrium concentrations of all four gases? How do these equilibrium values compare to the values when 0.750 mol of SO₃ and 0.750 mol of NO are placed in a 8.00 L container and allowed to react.

1) What alkene(s) will be produced when each of the following alcohols is dehydrated?

2- propanol

2- butanol

2) Why is phosphoric acid preferred over sulfuric acid for dehydration of alcohols?

3) What measures should be taken if droplets of phosphoric acid are splashed in the eyes?

4) Give an example of a skeletal rearrangement during a dehydration experiment.

5) What is the purpose of adding anhydrous sodium sulfate to the dehydration product in experiment B?

1) What alkene(s) will be produced when each of the following alcohols is dehydrated?

Cyclohexanol

2-methylcyclopentanol

3-methylcyclopentanol

2,3-dimethyl-2-butanol

2) Illustrate the mechanism for the acid-catalyzed dehydration of cyclohexanol.

3) Illustrate the mechanism for the acid-catalyzed dehydration of 2-methylcyclohexanol. How many products are possible?

4) Write equations to illustrate the reaction of cyclohexene with KMnO₄?

5) Given the following data, calculate the theoretical yield and percentage yield of cyclohexene:

Cyclohexanol used: 20.0 mL

Cyclohexene obtained: 12.0 g

1) What alkene(s) will be produced when each of the following alcohols is dehydrated?

Cyclopentanol

2-methyl-2-butanol

2) What is the purpose of adding 2% sodium carbonate solution to the distillate in Experiment A?

3) If 8.0 grams of cyclohexanol are used in Experiment A, add 5.5 grams of cyclohexene are produced, what is the percentage yield?

4) The dehydration of 3,3-dimethyl-2-butanol yields three different products. Write equations to show how carbocation rearrangements explain two of the products.

5) List four reagents that may be used as catalysts in the dehydration of alkenes.

)? How would you electroplate a brass object with silver?

What is EPNS?

How could you use electrodeposition to measure the purity of a sample of copper sulfate?

How is this process used industrially to purify copper?

1. The pressure of 5.85 L of an ideal gas in a flexible container is decreased to one-third of its original pressure, and its absolute temperature is decreased by one-half. What is the final volume of the gas?

2. A piece of sodium metal reacts completely with water as follows:

2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g)

The hydrogen gas generated is collected over water at 27.0°C. The volume of the gas is 175 mL measured at 0.969 atm. Calculate the number of grams of sodium used in the reaction. (The vapor pressure of water at 27.0°C = 0.0352 atm.)

How many milliliters of 0.500 M KOH should be added to 2.38 g of oxalic acid (molecular weight: 90.03, pKa1=1.46; pKa2=4.40) to give a pH of 4.50 when diluted to 250 mL?

Acid deposition is the transfer of acids in the atmosphere to Earth\'s surface through precipitation, fog, and aerosols. The presence of air pollutants, such as sulfur oxides (SOx) and nitrogen oxides (NOx), has caused acid deposition to occur. What are some of the results of acid deposition? Select all that apply.

corrosion of marble monuments

lower acidity levels in surface waters

greater soil nutrients

forest degradation

increased deaths from asthma

The role of catalysts is critical in many chemical reactions. They have great consequence in the fields of medicine and pharmacology. On the basis of your research, respond to the following: Identify the two important classes of catalysts. Choose a catalyst that exists in the human body. Explain its importance and how it works. Analyze the chemical reactions that take place when a biological catalyst combines with a reactant (substrate) to form an unstable intermediate.

A titration experiment is done with 1.37E-2 M NaOH to determine the acid concentration in 0.631 L of an unknown acidic solution. It was found that to reach the equivalence point 12.3 mL of strong base was needed. What was the pH of the original acidic solution?

How much heat is required to convert 74 grams of ice at -4 C into 74 grams of water at 52 c

Description A large percentage of drugs (>60%) are based on natural products that have been isolated from nature. For this assignment, pick a drug that is a natural product or is based on the structure of a natural product. The compound is required to have at least 4 chiral carbons. Students must choose a unique compound. Post the structure of the drug. (1 point) List four functional groups that are in the molecule. (2 points) Identify the chiral carbons and configuration (R or S) for each carbon. (2 points) Describe what the drug is used to treat. (1 point) List the source of the natural product. (2 points) List an interesting fact or why you picked this compound. (1 point) Include reference(s). (1 point)

Aluminum is a reactive metal. It reacts with oxygen to form aluminum oxide as shown below.

4 Al(s) + 3 O (g) → 2 Al O (s)

I. When one mole of aluminum reacts with excess oxygen how many moles of aluminum oxide will be produced? II. When one mole of oxygen reacts with excess aluminum how many moles of aluminum oxide will be produced? III. When one mole of aluminum reacts with one mole of oxygen how many moles of aluminum oxide will be produced?

Use the Henderson-Hasselbach equation to calculate the pH of each solution:

I figured out part A by myself because the numbers were already in Molarity for me so I just plugged in numbers and calculated.

B. A solution that contains 0.785% C5H5N by mass and 0.985% C5H5NHCl by mass. (Here, I don't know what to do with the %'s to get the molarity in order to find the pH.)

C. A solution that contains 15.0 g of HF and 25.0 g of NaF in 125 mL of solution. (Here,i thought i could just use the g and mL to find molarity using mol/L but that led me to the wrong answers.)

Please explain your process clearly as possible because I would really like to be prepared when i see these kinds of questions on my exam. Thanks!