If I have 2.5mL of KCl and 3 mL of water.

Which one is my solvent? _____________________________

Which one is my solute? ______________________________

Lab: Hydrolysis of polyethylene terephthalate using KOH

1. Why do we need to keep this reaction well stirred?

2. what is the scope of this reaction?

3. IR and NMR interpretation of dimethyl terephthalate

4. What is the role of 1-pentanol and water in this experiment?

5. Explain Alkaline hydrolysis of PET using KOH (in words).

I am supposed to map out the following and can't figure out how to do it! Can somebody help? The experiment has to do with determining the simplest formula of potassium chlorate and to determine the original amount of potassium chlorate in a potassium chlorate-potassium chloride mixture by measuring the oxygen lost from decomposition.

The chemical reaction is 2KClO3(s) ------> 2KCL(s) + 3 O2(g)

I am supposed to map out

1. Mass of oxygen lost in the first part

2. Number of moles of oxygen atoms evolved

3.Mass of potassium chloride(residue)

4.Number of moles of potassium chloride

5.Number of moles of potassium atoms in potassium chlorate

6.Number of moles of Clatoms in potassiu chlorate

7.Number of moles of oxygen atoms in potassium chlorate

8.Simplest formula of potassium chlorate

Part b

1.Mass of unknown mixture

2.Mass of oxygen lost

3.Number of moles of oxygen atoms evolved

4.number of moles of potassium chlorate decomposed

5.Mass of potassium chlorate in original sample

6.Percentage by weight of potassium chlloare in unknown

here are the data tables.

Results table A

Part B calculations

Using a 0.20 M phosphate buffer with a pH of 7.4, you add 0.71 mL of 0.45 M HCl to 51 mL of the buffer. What is the new pH of the solution?

51.       For a cell based on each of the following reactions run at standard conditions, calculate the emf of the cell, the standard free energy change of the reaction, and the equilibrium constant of the reaction: Get the Potentials from the table of standard reduction potentials available on Blackboard)

            a)         Mn(s) + Cd ⁺² (aq) ------> Mn⁺² (aq) + Cd(s)

            c)         2 Br ^- (aq) + I₂ (s) --------> Br₂ (l) + 2 I ^- (aq)

Metathesis reactions and net ionic equations:

Copper sulfate + Sodium Nitrate

molecular equation:

complete ionic equation:

net ionic equation:

driving force:

Sodium nitrate + sulfuric acid

molecular equation:

complete ionic equation:

net ionic equation:

driving force:

Copper sulfate + Sodium Hydroxide

molecular equation:

complete ionic equation:

net ionic equation:

driving force:

Copper sulfate + potassium phosphate

molecular equation:

complete ionic equation:

net ionic equation:

driving force:

Hydrochloric acid + Sodium Hydroxide

molecular equation:

complete ionic equation:

net ionic equation:

driving force:

Ammonium Chloride +sodium hydroxide

molecular equation:

complete ionic equation:

net ionic equation:

driving force:

1. Water is the best choice for use as a crystallization solvent whenever possible. Why?

2. Why do you crystallize your product as slowly as possible?

3. Why would n-propyl alcohol, CH3CH2CH2OH be more soluble in water than n-propyl bromide, CH3CH2CH2Br?

For each of the following pairs of semiconductors, which one will have the smaller band gap energy (Eg):

(a) C (diamond) or Ge,

(b) GaAs or ZnSe

(c) CdS or NaCl.

In each case, explain the reasoning for your choice.

1. Calculate the molarity of an HCl solution if a volume of 39.54 mL of this solution is required to titrate 0.2348 g Na2CO3. (Bromocresol green is used as an indicator).
2. This HCl solution (calculated in question 1.) is then used to analyze an unknown sample. Calculate the % Na2CO3 in the sample if a volume of 23.44 mL of the HCl solution is required to titrate 0.4089 g of the sample

Consider the system in which the mineral fluorite, CaF 2 , dissolves in water. The resulting
fluoride ion reacts with water to give HF. We are looking for the solubility of CaF 2 .
a. Write the pertinent chemical reactions. The hydrolysis of water is considered a
pertinent reaction in this system.
b. Write the charge balance. Include all of the charged species in all of the chemical
equations written above.
c. Write the mass balance.
d. Write the equilibrium expressions for each of the chemical reactions written above.
e. How many equations have you written? How many unknowns are there?
f. Solve the system of equations for the solubility of fluorite. It is not a simple
proposition to solve a system of five equations simultaneously. Consider what the
equilibrium system would look like if the pH were fixed at 3.00. Try solving the
equations now. It should now be a system of just three equations, which is much
easier.

Consider the three tubes below. Each contains a few drops of the color indicator bromothymol blue, which is yellow in acidic solutions and blue in basic solutions. One tube contains a solution of ammonium chloride, one contains ammonium acetate, and the third contains sodium acetate. Which beaker contains which salt? Explain your reasoning.

1st tube = yellow

2nd tube = green

3rd tube = blue

In treating an industrial wastewater, we add NaOH to remove Cr3+ ions (atomic weight) = 52). The chemical equation for the dissolution of Cr(OH)3 is
Cr(OH)3 (s) ↔ Cr3+ + 3OH-    (Ksp = 6.7*10-31)
What is the final equilibrium concentration (in mg/L) of Cr3+ ions in a solution of Cr(OH)3 when the water has a pH of 5?

1- How IMAF's would work to dissolve something?

2- give me one IMAF example

. Bath salts are typically composed of the ingredients listed below. Identify each item as being acidic, basic, or neutral when dissolved in water. If a particular ingredient does make an acidic or basic solution, describe how this occurs. Use the results of your in-lab observations, as well as your textbook and the provided Supplemental Information on pages 65-66, to support your conclusions.

2. In Experiment SOL, you investigated the solubility of oxalic acid. Sodium oxalate, Na₂C₂O­₄, is the sodium salt of this acid. Categorize it as acidic, basic, or neutral in water. Does the salt dissolve, dissociate, or both in aqueous solutions? What about oxalic acid; does it dissolve, dissociate, or both in water? Explain.