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Cad4U a local metal processing facility is at present violating its discharge permits for dissolved cadmium, Cd2+. The regulations are based on activity rather than concentration as well as so the savvy ore unethical chief chemist decided to alter the ionic strength to meet the discharge regulations. Currently the Cd2+ is discharged in very low ionic strength water (I<<0.001M). Three salts are available- MgBr2 ($5/mol), MgSO4 ($10/mol), and NaCl ($3/mol). If the Cd2+ activity should be lowered by at least 40%, which salt is the most economical choice?
A particular first-order reaction has a rate constant of 1.35 × 102 s-1 at 25°C. What is the magnitude of k at 75°C if Ea=85.6 kJ/mol
Calculate the radius of a Au (gold) atom if Au atom has a face-centered unit cell ? it is given that its density = 19.32 g/cm 3 .?
an aqueous solution is made by dissolving 2.569 grams of potassium phosphate k3po4 diluting to exactly 500.00ml in a
a student doing this experiment was puzzled by the fact that while each of the individual solutions being used is
Chromic acid is a diprotic acid H2CrO4 with Ka1 = 0.18 and Ka2 = 3.2 x 10-7. A solution of potassium chromate is prepared at pH 5.43. Calculate the fraction of the total chromate in this solution that is present as the chromate ion CrO42-.
Write a balanced equation for the combustion of heptane, C7H16, in oxygen, , forming the products carbon dioxide, and water, H2O. How many grams of water will be produced by the complete reaction of 7.88 grams of heptane?
ClF3 = polar 1) HOw many hybridized orbitals does the Cl use in bonding 2) Shape of the molecule
a 13 gram sample of calcium reacts with bromine to form 24 grams of calcium bromide. how many grams of bromine are used
Discuss the behavior of tungsten trioxide (or molybdenum trioxide) and product(s)
For each of the five principles of biochemistry give an example(step or series) from a biochemical pathway that satisfies each principle
What would be the initial pH of Buffer C. If you add 5.0 mL of 0.5 M NaOH solution to 20.0 mL each of Buffer B and Buffer C, which buffer's pH would change less. Explain.
How much heat is evolved when 1235 g of water condenses to a liquid at 100°C? ΔHcond = -40.7 kJ/mol.
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