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Write the Henderson-Hasselbalch equation for a solution of propanoic acid (CH3CH2CO2H, pKa = 4.874 ) using HA and A- in the expression. Using this equation, calculate the quotient [A-]/[HA] at A) pH 4.56 B) pH 4.874 C) pH 5.40.
What is the solubility of BaF2 (Ksp = 1.8x10-7) in pure water in grams per liter? The molecular weight of BaF2 is 175.
Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.100 M HClO(aq) with 0.100 M KOH(aq). (a) before addition of any KOH
How many grams of CaH2 are needed to generate 147 L of H2 gas if the pressure of is 824 torr at 295K ?
The additive was a compound containing carbon, hydrogen and lead (Pb). When 51.36 g of this compound was burned in excess oxygen, 55.90 g of CO2 and 28.61 g of H2O were produced. Determine the empirical formula of the compound.
gaseous mixture of 2.34 kg of silane, Sih4 and 55.4 kg of Argon. Determine the mole fraction of silane
Calculate the Pickering series wavelength associated with the excited state ni = 8. B)What region of the electromagnetic spectrum does this transition fall in? gamma ,x-ray ,visible ,radio ,microwave ,infrared ,ultraviolet
Which of the following compounds would have the lowest boiling point. a) CH4 b) HF C)K2O D) NO2 E) LiCl
Calculate the molar solubility of Cu(OH)2, Ksp = 2.2 × 10-20, in 0.82 M NH3. Don't forget to use the complexation reaction Cu2+ + 4 NH3 ? Cu(NH3)42+, K = 5.0 × 1013.
Nutrition experts recommend that you drink at least 8 cups of water daily. If your local water supply contains 1.00 part floride (by mass) per million parts water, how many milligrams of floride would you consume daily in your 8 cups of water
Calculate the molar mass (g/mol) of a gas whose root mean square speed is 796 m/s at 512 K.
How much energy is released when 32.4 g of water freezes? The heat of fusion for water is 6.02 kJ/mol
Predict the magnetic susceptibilities (para- or diamagnetic) and determine the number of unpaired electrons of each of the following complexes (consider C2O42- and H2O as strong field ligands which cause a large splitting of the d-orbitals).
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