1. What are the [H2AsO4-] and [AsO4^3-] in a solution of 2.3 M arsenic acid?

2. What is the pH of a solution made by mixing 9.00 grams of ethylamine, C2H5NH2, with enough water to make 750.0 mL of solution?

How many grams of ethylene glycol (C2H6O2) must be added to 1.20 kg of water to produce a solution that freezes at -3.88 ?C?

a) two 10.0 Ml water samples were taking The procedure in this experiment is followed to determine the phosphate concentration. What would be the average phosphate concentration in the solution be( in units of molarity) if the student obtained 0.5133g and 0.5275g of struvite using gravimetric analysis? show all work assume this procedure precipitates out all of the phosphate from the sample in form of struvite. b) what would be the concentration of the phosphate ion (Po4^3-) in the water sample from the previous question (a) in units of parts per millon

(a) Balance the following half-reactions by the ion-electron half-reaction method:

(i) (acid solution) NO3 – (aq) → N2O (g)

(ii) (acid solution) FeO4 2– (aq) → Fe3+ (aq)

(iii) (base solution) Fe2O3 (s) → Fe(OH)2 (s)

(iv) (base solution) Cu2O (s) → Cu(OH)2 (s)

(b) Which of the above equations are oxidation half-reactions?

(c) Give the formulas of the reactants that become oxidized in the course of the reaction.

A compound of molar mass 213 contains only carbon, hydrogen, iodine, and oxygen. Analysis shows that a sample of the compound contains 6 times as much carbon as hydrogen, by mass.Calculate the molecular formula of the compound. Express your answer as a chemical formula. Enter the elements in the order: C, H, O, I.

Consider a reaction with the following thermodynamic properties.

This reaction:

will proceed very slowly.

will be spontaneous at low temperatures.

has bonds in the products that are weaker than the reactants.

may have fewer and more complicated molecules in the product.

What factors will influence the migration rate in CE? What factors may increase the resolution of CE?

In a series of experiments, the U.S. Navy developed an undersea habitat. In one experiment, the mole percent composition of the atmosphere in the undersea habitat was 79.0% He, 17.0% N₂, and 4.00% O₂. What will the partial pressure of each gas be when the habitat is at a depth below sea level where the pressure is 5.41 atm?

A) An aqueous solution is 3.50% by mass hydrochloric acid, HCl, and has a density of 1.02 g/mL.  

The molality of hydrochloric acid in the solution is ____ m.

B) An aqueous solution of iron(III) sulfate has a concentration of 0.192 molal.  

The percent by mass of iron(III) sulfate in the solution is ____ %.

Explain why bond polarity and molecule polarity are two separate characteristics.

Yeast are unicellular eukaryotic organisms that have been utilized for thousands of years to produce leavened (risen) bread and alcoholic beverages. To make leavened bread yeast are added to the bread dough and once it is placed in a warm place, the yeast cause the bread to rise. Knowing what you do about glycolysis and the fates of pyruvate, explain biochemically why the bread rises.

An aqueous solution containing 1.00 g of oxobutanedioc acid (FM 132.07) per 100 mL was titrated with 0.09432 M NaOH.

1. Calculate the pH at th following volumes of added base: 0.5V_e1, V_e1, 1.5V_e2, V_e2, 1.05V_e2
2. Sketch the titration curve, using the values calculated above.
3. Which equivalence point would be best to use in this titration (which one is not blurred)?

Ka1 = 2.56

Ka2 = 4.37

Ve1 = equivalence point 1

Ve2 = equivalence point 2

1. Sketch a proposed set up for the hot bath. Make sure that all of the listed equipment is included in the sketch (the drawing does not have to be of professional quality, of course.)

2. Calculate the theoretical yield of aspirin if 1.05 g of salicylic acid is combined with 2.0 mL of acetic anhydride. Follow your Result Sheet if you need help.

3. What is an ester?

4. Why is sulfuric acid added to the esterification reaction?

Can you detect any trends in formula, mass and boiling point bp in going down this series of molecules? What would you predict as a rule for determining bp? Can you support your hypothesis?