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A chemist must prepare 0.9 L of sodium hydroxide solution with a pH of 13.40 at 25 C. He will do this in three steps: Fill a 0.9 L volumetric flask about halfway with distilled water. Weigh out a small amount of solid sodium hydroxide and add it to the flask. Fill the flask to the mark with distilled water. Calculate the mass of sodium hydroxide that the chemist must weigh out in the second step.
What is the pH of a solution resulting from the addition of 11.9 mL of 0.20 M HCl to 50.0 mL of 0.12 M NH3? Assume the volumes are additive. Kb of NH3 = 1.8 10-5.
Determine the amount of energy involved in calories given off when 85 grams of H2O cools from 45 degrees Celsius to 25 degrees Celsius?
density measurements can be used to analyze mixtures. for example the density of solid sand without air spaces is about
Another Reaction, A -> Products, is a first order reaction. An experiment was performed at 25C which determined the rate constant is 0.015min^-1. THe activation energy of this reaction is +34.8kJ/mol. Calculate the temperature, in C, of the reacti..
What would a developed TLC plate look like if the original plate was placed so that the spotting line was below the developing solvent level
What is the pH after 0.150mol of HCl is added to the buffer from Part A. Assume no volume change on the addition of the acid. Express the pH numerically to two decimal places.
Four liters of water are equilibrated with a gas mixture containing carbon dioxide at a partial pressure of .3 atm. Henry's law constant for H2CO3* solubility is 2.0 g/L-atm.
Liquid sodium can be used as a heat transfer fluid. It's vapor pressure is 40.0 torr at 633 Celsius and 400.0 Torr at 823 Celsius. Calculate its heat of vaporization.
A study of the system 4NH3(g)+7O2(g)--2N2O4(g)+6H2O(g), was carried out. A system was prepared with [NH3]=[O2]=3.60 M as the only components initially.
Draw oxygen-binding curves for crocodile hemoglobin in the presence and absence of bicarbonate. Which conditions increase the p50 value for crocodile hemoglobin? What does this tell you about the oxygen-binding affinity of hemoglobin under those c..
a miner working 260 m below sea level opened a carbonated soft drink during lunch break. to his surprise the soft drink
The water temperature before the reaction was 34.5°C, and after the reaction it had risen to 52.0°C. How many moles of water were formed?
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