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1. During an experiment, a student mixed 14.5mL of a 0.500M sodium fluoride solution with 15.6mL of a 0.750M hydrofluoric acid solution, the measured pH was 3.24. Calculate the pKa.
2. Calculate the pH of a solution prepared by mixing 20.5mL of a 0.500M sodium fluoride solution with 32.5mL of a 0.750M hydrofluoric acid solution.
Estimate the pH at the equivalence point of an HOAc solution if 25.5 mL of this solution required 37.5 mL of 0.175 M NaOH to reach the equivalence point (Ka = 1.8 x 10-5).
An element has ccp packing with a face-centered cubic unit cell. Its density is 11.4 g/mL and the unit cell volume is 1.21 x 10-25 L. Calculate the molar mass (g/mol) of the element to three significant figures.
When NEM is added to a solution of creatine kinase, Cys 278 is alkylated, but no other Cys residues in the protein are modified. What can you infer about the role of the Cys 278 residue based on this information
Write a brief discussion of the bond dipoles of iodomethane and the corresponding Grignard reagent.
Rewrite the atomic cores in the space below. Place an electron pair between each hydrogen atom and the sulfur atom. Write the lewis structure for hydrogen sulfide in the box, distirbuting the remaining valence electrons so that the hydrogen atoms ar..
At 570. mm Hg and 25C, a gas sample has a volume of 2270 mL. What is the final pressure (in mm Hg) at a volume of 1250 mL and a temp of 175C?
the meta and para forms of phenylene diamine are used in the production of Kevlar and Nomex, respectively. Why is a corresponding material with similar properties not made from ortho-phynelene diamine
In a test tube, 10 mL of 0.100 M KI and 10 mL of 0.100 M Na2CO3 are mixed. Next, 0.10 M lead nitrate is added drop wise. What will be the concentration of CO3 2- when PbI2 first starts to precipitate? Ksp (PbCO3) = 1.5 x 10^-13 Ksp (PbI2) = 8.7 x 1..
a gas sample occupies a volume of 396 ml at a pressure of 1.28 atm and 72 degree celsius. compute the volume of the gas
what mass of water would need to evaporate from your skin in order to dissipate 1.7 times 105 j of heat from your body?
The entropy of a gas is larger than that of the liquid because the specific volume of gas is greater thus implying more mutual configurations are allowed for molecules in a gas than in the corresponding liquid.
Classify each of the following as a binary ionic compound, ternary ionic compound, binary molecular compound, or ternary oxyacid. 1.) Hydrazine, N2H4 2.) Nitrous Acid, HN02(aq) 3.) Cobalt(II) Nitride, Co3N2 4.) Sodium Nitride, NaNO2
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