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How many grams of potassium accetate must be added to 2.5 L of .250 M acetic acid to obtain a buffer at pH = 4.26?
1.013-g sample of ZnSO4•xH2O is dissolved in an aqueous solution of BaCl2. The pure BaSO4 precipitate is filtered out of solution, dried, and its mass is determined to be 0.8223 g. What is the value of x in ZnSO4•xH2O?
Imagine that you have a 7.00 gas tank and a 3.50 gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch.
For the reaction 2A + B --> 2C, if B is initially 4.0M and 2min later is 3.0M, what is the rate of appearance of C?
ow many stereo-isomers would there be if a molecule had four chiral centres, Rank the different carbocations in order of their stability.
Qualitatively, describe how an acid-base indicator works. Why do we want to use a minimum amount of indicator in a titration? Select all that apply.
A 29.0-g sample of water at 260. K is mixed with 51.0 g water at 340. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
Do you expect CN- anion to be affected by a magnetic field? Explain your reasoning. (d) What is the bond order of the anion CN- ? (e) What is the bond order of the neutral CN?
Using the equation pKa= -log Ka, calculate the Ka from the pH value and the starting acetic acid concentration. Calculate the Ka of acetic acid.
Calculate brightness of a wavelength undergoing Rayleigh scattering.
How long will it take 10.0 mL of neon gas to effuse through a porous barrier if it has been observed that 91.2 minutes are required for 10.0 mL of Cl2 gas to effuse through the same barrier?
How much heat is required to raise the temperature of 5.5 x 10^2 g of aluminum by 10°C?
what would the rate constant be at a temperature of 150C for the same reaction described in Part A?
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