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The pKb values for the dibasic base B are pKb1 = 2.1 and pKb2 = 7.8. Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.75 M B(aq) with 0.75 M HCl(aq).
(a) before addition of any HCl (b) after addition of 25.0 mL of HCl (c) after addition of 50.0 mL of HCl (d) after addition of 75.0 mL of HCl (e) after addition of 100.0 mL of HCl
The gas effuses at a rate that is 0.404 times that of neon in the same apparatus under the same conditions. How many atoms are in a molecule of gaseous white phosphorus?
During the saponification of ethyl tetradecanoate, would you expect the product to generate foam/froth when mixed
A solution contains 1.35 g of Ca(OH)2 in 875 mL of solution. Find the normality of the solution.
A piece of metal ore weighs 8.25 g. When a student places it into a container of water, the liquid level rises from 21.25 mL to 26.47 mL. What is the density of the ore?
What is the maximum fermenter diameter that can support heat removal from a culture growing at 16 degrees Celcius with an oxygen uptake rate (OUR) of 200 mM/L/hr when cooling water
what is the enthapy change needed to heat 1 kg of water at 0.4 MPa and 4°C to steam at 150°C and 0.4 MPa? b/ Does a state change from saturated vapor at 230°C to the state 100°C and 0.05 MPa represent an enthalpy increase or decrease?
Calculate the heat released when 1.95 L of Cl2(g) with a density of 1.88 g/L reacts with an excess of sodium metal at 25°C and 1 atm to form sodium chloride.
Many important drugs contain the amine functional group, which makes them basic. Many drugs also contain an amide group, which is effectively neutral. Suggest a way to separate ephedrine, a stimulant and decongestant drug shown below
Determine the product of the reaction. As a general rule, a metal will combine with a nonmetal to form an ionic compound.
In a calorimeter, 10.0 g of ice melts at 0oC. The enthalpy of fusion of the ice is 334 J/g. How much heat was absorbed?
A 25.0 mL sample of river water was titrated with 0.0010 M Na2Cr2O7 and required 8.3 mL to reach the end-point. What is the chemical oxygen demand, in milligrams of O2 per liter, of the sample?
The radius of a uranium atom is 149 pm. How many uranium atoms would have to be laid side by side to span a distance of 4.55 mm?
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