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A buffer solution is prepared by mixing 50.0mL of 0.300 M NH3(aq) with 50.0mL of 0.300 M NH4Cl(aq). The pKb of NH3 is 4.74.
NH3 + H20 ----> NH4+ + OH-
Calculate the [NH3] and [NH4Cl] in the buffer solution. Calculate the pH of the buffer solution.
Calculate the enthalpy change for converting 10.00g of ice at -25.0°C to water at 70.0°C in kJ. The specific heats of ice, water, and steam are 2.09 J/g-K, 4.18 J/g-K, and 1.84 J/g-K,.
Determine the freezing point of a solution which contains 0.31 mol of sucrose in 175 g of water. Kf = 1.86°C/m
An unknown gas sample with a mass of 3.17 g and a volume of 0.7521 L at 293.0 K under 1.023 atm has CH2Cl for its empirical formula. What are its molar mass and its molecular formula?
What is the pH of a buffer prepared by dissolving 0.238 g of NaNO2 in 2.50 L of 1.5 x 10-3 M HNO2, Ka (HNO2) = 6.0 x 10-4?
What is the approximate pH at the equivalence point of a weak acid-strong base titration if 25 mL of aqueous hydrofluoric acid requires
A rigid ball that contained 25.0 liters of air at 22°C and 6.25 atm pressure was placed in an oven at a temperature of What was the new pressure inside the ball?
A 0.100M (as prepared) solution of dichloroacetic acid has an observed [H30+]= .043 M. What are the equilibrium concentrations and the value of the equilibrium constant for the reaction shown?
Assume that the estimates of the standard deviation for the mean mass of a series of three measurements, a serious of six measurements, and a series of nine measurements were identical.
What is the number of H's per signal and the splitting for each signal for 2 chloropropane in an NMR?
What is the percentage yield of SO3 if 22.3 g SO3 are obtained from the reaction of 25.0 g SO2 with an excess of O2.
How many grams of are CaH2 needed to generate 147L of H2 gas if the pressure of H2 is 827 torr at 20 C?
A 122 piece of metal is heated to 285 and dropped into 84.0 of water at 26. If the final temperature of the water and metal is 58.3, what is the specific heat of the metal.
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