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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).
(b) after addition of 25.0 mL of HCl
When 228.4 mg of pure X was burned 627.4 mg of CO2 and 171.2 mg of H2O were obtained. Determine the simplest formula of the compound X.
The initial solution of B was 0.100 M and had a volume of 100.0 mL. Find the pH at the following volumes of acid added Va = 0, 5 ,10, and 15 mL.
What is the binding energy, in amu, of 13C? Masses are: proton = 1.00728 amu, neutron = 1.00867 amu, electron = 0.00055 amu, and 13C = 13.00335 amu.
A sample of molten iron occupies a volume of 7.11 x 10-3 L. If the density of iron is 7.86 g/cm3, what is the mass of iron in grams in the sample?
acetic acid has one carbon- oxygen bond that is 1.36 A nd another 1.23 A however sodium acetate has two equal carbon- oxygen bonds
Explain Threshold / NOEL Levels of Chemical Toxins, What is the maximum average daily consumption(g) of such fish that would keep exposure level below the ADI or RfD for the compound?
If 2.55 g of NaOH were added to a 100.0 mL solution containing 0.10 M Ca(NO3)2, what concentration of Ca 2+ remains in solution?
What is the minimum uncertainty in the position of an electron, given that we know nothing about its speed except that it is less than the speed of light?
if a 210 mg piece of gold (density=19.32 b/cm^3) is hammered into a sheep measuring 2.3*10 ft. what is the average thickness of the sheet in meters?
what will be the volume of the blimp at a height of 2300 m, where the temperature is 12°C?
What would be the diameter, in cm, of a uranium round shot which has exactly twice the weight as the iron ball described above? 1 pound = 0.4536 kg.
A sports beverage company is seeking an energy supplement to increase the performance of the athletes. An ongoing research project suggest the use of a tetrasaccharide with the following characteristics
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