You take a representative soil sample and determine the following data: Exchangeable cation cmolc/kg of soil Ca2+ 2.7 Mg2+ 1.0 K+ 0.1 H+ 1.0 Al3+ 2.8 Na+ 0.1 1) What is the CEC (cmolc/kg ) of this soil?
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You take a representative soil sample and determine the following data:
Exchangeable cation |
cmolc/kg of soil |
|
Ca2+ |
2.7 |
|
Mg2+ |
1.0 |
|
K+ |
0.1 |
|
H+ |
1.0 |
|
Al3+ |
2.8 |
|
Na+ |
0.1 |
1) What is the CEC (cmolc/kg ) of this soil?
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- Some wastewater stream contains 0.015 M Hg22+. Some chemical engineer decides to remove it by precipitating it as Hg2CO3(s). He mixes 100.00 ml of the wasterwater with 100.00 ml of a 2.00 M solution of Na2CO3 and filters the result to remove the solid. How much residual Hg22+ should he expect to find still in the water? (Hint: it should not be 0) Ksp of. Hg2CO3 = 9.0 x 10-15. Also keep in mind that Hg+ is the only ion that exists in solutions as a dimer, i.e. Hg22+, not 2 Hg+ (Hg2CO3→ Hg22+ + CO32-)A unique plant was discovered from the hot springs of Maquinit, Coron, Palawan. To study the activity of the plant, approximately 5.00 g of the fresh plant was finely cut and ground and then mixed with an extraction buffer to make up a total of 1.00 mL crude plant extract. Approximately 19.00 mL of water was added to the plant extract. To determine the protein concentration of the extract, a bovine serum albumin (BSA) stock solution with a concentration of 300 μg mL-1 was used and mixtures with the following compositions and absorbance readings were prepared: A 100 μL aliquot of the diluted plant extract was added with 400 μL of water and was subjected to Bradford assay. Determine the protein concentration, in mg mL-1, of the original 1.00 mL crude extract if the absorbance of the diluted aliquot extract acquired from the analysis is 0.234.one or more answers Which of the following will result in an increase in the calculated Ksp of Ca(OH)2? Receiving flask used during filtration was contaminated with HCl The Na2CO3 primary standard solution was overtitrated The saturated Ca(OH)2 solution was overtitrated Some Ca(OH)2 solid passed through the filter paper during filtration The water used to dissolve Ca(OH)2 solid was greater than the required amount
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- The %purity of a powdered crude sample of Na2CO3 containing only inert impurities is to be determined by reacting 225.0 mg of the crude sample to 10.0 mL of 3.00 M HCl solution, and bubbling the resulting CO2(g) product in water that is at exactly 29 °C. After the reaction has completed, the level of the liquid inside the eudiometer rests 4.30 cm above the water level in the beaker. The graduation on the eudiometer indicates that the trapped gas is 44.37 mL. The experiment was done under a barometric pressure of 755.2 torr. a. How many moles of CO2 were collected? b. What is the percent purity of the sample? Round off to the nearest whole numberThe %purity of a powdered crude sample of Na2CO3 containing only inert impurities is to be determined by reacting 225.0 mg of the crude sample to 10.0 mL of 3.00 M HCl solution, and bubbling the resulting CO2(g) product in water that is at exactly 29 °C. After the reaction has completed, the level of the liquid inside the eudiometer rests 4.30 cm above the water level in the beaker. The graduation on the eudiometer indicates that the trapped gas is 44.37 mL. The experiment was done under a barometric pressure of 755.2 torr. What CASE does this experiment satisfy?You are trying to come up with a drug to inhibit the activity of an enzyme thought to have a role in liver disease. In the laboratory the enzyme was shown to have a Km of 1.0 x 10-6 M and Vmax of 0.1 micromoles/min.mg measured at room temperature. You developed a competitive inhibitor. In the presence of 5.0 x 10-5 M inhibitor, the apparent Km of the enzyme was found to be 1.5 x 10-5 M. What is the Ki of the inhibitor?
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