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Strong base is dissolved in 655 mL of 0.200 M weak acid (Ka = 3.12 × 10-5) to make a buffer with a pH of 3.90. Assume that the volume remains constant when the base is added. a) Calculate the pKa value of the acid and determine the number of moles of acid initially present. b) When the reaction is complete, what is the concentration ratio of conjugate base to acid? c) How many moles of strong base were initially added?
Calculate the change in pH when 6.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq)
Strong base is dissolved in 615 mL of 0.400 M weak acid (Ka = 4.50 × 10-5) to make a buffer with a pH of 3.95. Assume that the volume remains constant when the base is added.
At high pressures, real gases do not behave ideally. Use the van der waals equation and data in the text to calculate the pressure exerted by 18 gram of H2 at 20C in a 1.00L container.
At 0.0 C, if the volume of air is 2 mL and the pressure of the atmosphere that day is 665 mmHg, what is the number of moles of air?
Calculate the solubility (in M units) of ammonia gas in water at 298 K and a partial pressure of 7.50bar . The Henry's law constant for ammonia gas at 298 K is 58.0 M atm and 1 bar = 0.9869 atm.
When X-rays with a wavelength of 154 pm (pm = 10^-12 m) are diffracted from an unknown crystalline compound, the first reflection occurs at theta= 4.24 What distance does that correspond to? (assume n =1)
Trichlorofluoromethane (CCl3F) boils are 23.8C and its molar heat of vaporization is 24.8 kj/mol. Calculate the molar entropy of evaporation of CC3F (l)
None of the desired ether was obtained. What product was formed and why did this route to the ether fail? Suggest a different substitution reaction that should yield the desired product.
Write molecular, total ionic, and net ionic equations for the reaction of AgNO3 and NaCl (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer.)
Examining the experimental setup, the students finds an air pocket between the stopper at one end of the U-tube and the electrolyte solution inside the tube
How many mL of 0.0221 M KMnO4 would it take to titrate a 0.5255 g sample of K3Fe(Ox)3? How could the results of your titration be used to determine if the sample was actually a mixture of K3Fe(Ox)3 and K4Fe(Ox)3
the temperature of the tire increases to 40.0 ?C). What is the tire pressure in psi assuming no change in volume for the tire? (1 atm = 14.70 psi).
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