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A chemist wanted to determine the concentration of a solution of lactic acid, HC3H5O3. She found that the pH of the solution was 2.49. What was the concentration of the solution? The Ka of lactic acid is 1.4 10-4.
Determine what mass of titanium displaces 65.6mL of H 2 O at the temperature 25 degree Celsius if the density of titanium metal is 4.51 g/cm 3 at the temperature of 25 ° C .?
Using the inverse square law of radiation, what Geiger counter reading would you get for a radioactive material when you are 3 feet from the source
Draw a molecular orbital picture for the pi system of each reagent in the [3+2] cycloaddition reaction of ozone with an alkene. Be sure to label the homo and lumo of each.
calculate the amount of energy necessary to vaporize 10 g of acetone at its boiling point if the heat of vaporization is 29.1 kJ/mol.
A helium-filled weather balloon has a volume of 2.4 × 102 L at 99 kPa pressure and a temperature of 0°C. What is the mass of the helium in the balloon?
Consider the titration of a 25.0 mL sample of .125M RbOH with .105M HCl. Find the initial pH.
We wish to prepare a buffer of pH 10 using common laboratory reagents. How many mL of 6M HCl would we have to add to a solution prepared by adding 100 mL of 15M NH3 to 200 mL of water?
A solution of Na2CO3 is added dropwise to a solution that contains 1.14Ã-10âˆ'2 M Fe and 1.53Ã-10âˆ'2 M Cd . What concentration of CO3 is need to initiate precipitation?
Draw lewis Dot structures. Use model kits, styrofoam balls and/or gum drops to make a model of the molecule or ion. Be sure to place electron groups (toothpicks or sticks) as far apart as possible.
How many grams of KCl would be required to react with 420 mL of 0.42 M AgNO3 solution?
Complete the following equations in molecular form. The reactant coefficients are correct. Indicate precipitation, redox, or acid – base. Write the equations in NET ionic form (no spectator s). Balance charges and use the correct suffixes.
What is the total volume of gases produced at 819K and 1atm pressure when 256 g of ammonium nitrate (NH4NO2) undergoes the following decomposition?
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