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MnO4- is deep purple in aqueous solution, while Mn2+ is colorless. Suppose a solution of KMnO4 is being used as a sample in a redox titration against iron(II) sulfate. What would be indicated by a sudden color change in the solution from purple to colorless?
When 414 J of heat is added to the gas, it expands and does 104 J of work on the surroundings. What is the value of delta H?
A solution (volume = 100.0 ml) contains 0.27 M HCOOH(formic acid, Ka=1.8*10^-4) and 0.39 M KHCOO. a. Determine the pH of the solution b. We add 4.00 ml of 4.0 M HNO3 to this solution. Determine the new pH.
A piece of metal with a mass of 18.2 grams was dropped into a graduated cylinder containing 16.50mL of water. The graduated cylinder after the addition of the metal is 18.40. Determine the density of the metal.
What is the approximate ratio of the molar concentrations of CO_2(aq) in the soda before it is opened to that in the soda after it has been opened and reached equilibrium with the surrounding atmosphere
What is the charge on magnesium iodide? What does the charge on the magnesium ion have to do with the number of valence electrons that an atom of magnesium has?
At room temperature (about 20degree C) milk turms sour in about 64 hours. In a refrigerator at 3 degree C, milk can be stored for about three times as long before turning sour.
Mass(volume)of cold water:75.0g Temperature of cold water: 23.0 degree celsius Mass(volume) of hot water: 75.0g Final temperature: 41.1 degree celsius find the temperature change and the calorimeter constant.
Calculate the apparent degree of dissociation of the NH4Cl if the freezing point of this solution is -15.3OC?(Molal freezing point constant =1.86 0C)
Suppose we add 10.5 g or 0.100 mol of sodium acetate, NaC2H3O2 to 1 L of a 0.100 M solution of acetic acid HC2H3O2. What is the pH of the resultant solution?
What happens to the interference pattern that results from the diffraction of electrons passing through two closely spaced slits if the rate of electrons going through the slits is decreased to one electron per hour
Calculate the cell potential for the following reaction that takes placen in an electrochemical cell at 25 degrees C.
If the molecular weight of a molecule is 180, how many grams would be required to make 100 milliliters of a 2 molar solution
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