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Given a stock solution of glucose (2 M), dihydrogen sodium phosphate (0.1 M) and arginine (50 mM), how much of each solution do you need to prepare 1 L of buffer containing 20 mM glucose, 30 mM dihydrogen sodium phosphate, and arginine 1 mM? Explain in words how would prepare this solution.
A 20.00 mL solution of nitric acid, HNO3, required 25.7 mL of 0.1313 M NaOH to reach a bromthymol blue end point. What is the concentration of the nitric acid solution
a sample of riboflavin has a molar absorptivity of 1.67 x 10^3 L(mol x cm). What is the concentration of a solution with an absorbance of 0.484? The pathlength is 1.00cm.
A chemistry lab experiment requires 28.6 g of silver nitrate. How many grams of a 19.1% by mass solution of silver nitrate should be used
56.0 mL of a 1.20 M solution is diluted to a volume of 248 mL. A 124-mL portion of that solution is diluted using 157 mL of water. What is the final concentration?
Balance each of the following equations and choose the appropriate expression for its equilibrium constant. a. NO(g)--> N2O(g)+NO2(g)
A piece of iron limestone weighing 0.1965g was allowed to react with an excess of hydrochloric acid. The calcium in it was precipitated as calcium ethanedioate.
There is an increase in temperature of 56 K. Calculate the heat lost or gained by the system in response to this change in the external temperature. Express your answer in J. Heat capacity for Helium = 20.8 J/(mol K) Molecular weight for Helium = ..
Calculate the concentration of solution containing one mole of phophate per litre
Find a parametric representation for the plane that passes through the point (?2, 2, 1) and contains the vectors i + j ? k and i ? j + k.
Benzene has a heat of vaporization of 30.72 kJ/mol and a normal boiling point of 80.1 C. At what temperature does benzene boil when the external pressure is 480 torr?
the instruction booklet for your pressure cooker indicates that its highest setting is 12.5 . you know that standard
24.6g of a hydrated salt of MgSO4.XH20, gives 12.0g of anhydrous MgSO4 on heating. What is the value of x?
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