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If a student performed the experiment illustrated in this module. She first standardized her DCP solution by preparing an ascorbic acid solution containing 46mg of reagent-grade ascorbic acid. Three 10.00mL samples of the ascorbic acid solution necessary an average of 25.7mL of titrant for the complete reaction.
1) Compute the mean molarities of the DCP solution.
How many mL of 1.74 M HCl solution can react with 71.5 g calcium carbonate? CaCO3(s) + 2 HCl(aq) ? CaCl2(aq) + H2O(l) + CO2(g)?
Draw a tetra-peptide that FPHD at pH 2.0. Clearly indicate with a circle what groups would be charged if the pH was changed to 12.0. Draw a box around the peptide bonds
What is the enthalpy of this reaction? Assume that no heat is lost to the surroundings or to the coffee cup itself and that the specific heat of the solution is the same as that of pure water.
Compare and contrast solid-phase DNA synthesis with enzyme-catalyzed DNA synthesis. Please separately describe the similarities and differences between the two.
A 50% KOH solution (d= 1.52 g/mL) is made by adding 50 grams of KOH and enough water until the weight of the solution is 100 g. Calculate the molarity of the 50% KOH solution.
in order to create an engineered human hemoglobin molecule that had the same bicarbonate binding properties as
A gas occupies 74.12L at 41.2 degrees Celsius and 764 mm Hg. What will be the temperature if the gas is compressed to a volume of 44.27L and a pressure of 1002 MM Hg
Addition of a catalyst lowers the activation energy by 15.0 kJ/mol. By what factor (k catalyzed/ k uncatalyzed) does the rate increase at 25 °C?
ice melts at 273.15K with delta H fusion = 6.01 kJ/mol. if the ice mass is 13.8 kg in a swimming pool whose temperature is held at 22.5 degree Celsius. What is the entropy change for melting the ice?
The heat required to raise the temperature of a large cup of water (for coffee) from room temperature to boiling is approximately 100 kJ. Express this quantity of heat in kilocalories and British thermal units.
What is the pH of a buffer solution made with 20 g of acetic acid and 30 g of sodium acetate in 450 mL of water? (Ka = 1.8 x 10-5). If concentrated HCl is added, will the pH increase or decrease?
the expresssion for the freezing point depression of a solution relative to that of the pure solute is shown above.
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