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A 0.1276 g sample of a monoprotic acid (molar mass = 1.10 x 10^2) was dissolved in 25.0 mL of water and titrated with 0.0633 M NaOH. After 10.0 mL of base has been added, the pH was determined to be 5.07. What is the Ka for the acid?
Purine biosynthesis is allowed to take place in the presence of [N15]aspartate, and the newly synthesized GTP and ATP are isolated. What positions are labeled in the two nucleotides?
Determine the half- life, in hours of iodine-123 If the amount of radioactive Iodine-123 in a sample decreases from 0.4 grams to 0.1 grams in 26.4 hours?
NaOH required for titration of 10 mL of monoprotic acid solution. What was the original concentration of acid? What was the original pH of acid solution if its pKa is 5.3?
They are all buffer solutions and would all have the same capacity 2) Of the following solutions, which has the greatest buffering capacity?
along with the weight of sodium acetate (4.01g) and the volume of acetic acid used (10mL) to prepare the buffer, the expected pH of it was 5.43. What is the expected pH of buffer plus added HCl?
The boiling point of a solution containing 10.44 g of an unknown nonelectrolyte in 50.00 g of acetic acid is 159.2°C. What is the molar mass of the solute?
A soluution prepared by dissolving 682 mg of a sugar (a molecular compound and a nonelectrolyte) in 1.00g of water froze at -3.72 degrees C. What is the molar mass of this sugar?
what is the mass of iron in grams in the sample? a. 0.000904 g b. 0.0559 g c. 0.904 g d. 1.105 g e. 55.85 g
You have 493 mL of chlorine trifluoride gas at 699mmHg and 45 degrees Celsius. What is the mass (in grams) of the sample.
An unknown gas has been determined to have the empirical formula CH2. At 27°C and 0.966 atm, the gas has a density of 1.65 g/L. What is the molecular formula of this gas
Determine the numbers of moles of iron that would be formed from 6.2 moles of CO (carbon monoxide) combining with excess of iron (III) oxide (Fe2O 3 )?
How many moles of a monoprotic acid with a Ka=4.9x10^-6 must be dissolved in 750 ml of H2O to produce a solution with pH=4.50
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