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Given: 1 Liter H2O with a pH of 7. How much HCl (M.W. of 36.5g/mole) needs to be added to lower the pH of the water to 3?
what is the pH of a buffer solution made by dissolving 0.060 mol of formic acid ( pmKa =3.7) and 0.045 mol of sodium formate to make 500 mL of solution
solution of water (Kf = 1.86^ C/m) and glucose freezes at - 2.55^ C. What is the molal concentration of glucose in this solution? Assume that the freezing point of pure water is 0.00 ^ C.
A pound of coffee beans yields 53 cups of coffee (4 cups = 1 ). How many milliliters of coffee can be obtained from 1 of coffee beans?
f the water if brought to the vapour state at 204C and 710 KPa, where its enthalpy is 2649.4 KJ/Kg and its specific volume is 291.8 cm^3/g, what is the internal energy (U) at these conditions in KJ/Kg? c) Calculate the change in internal energy (d..
2 liquids, A and B, have the same molecular weight. Samples of each are placed on temperature probes and allowed to evaporate. After a period of time Liquid A had a change in temp
An unknown hydrate of calcium nitrate, Ca(NO3)2 * XH2O, is heated to give 30.5% water. What is the water of crystallization (X) for the hydrate
A reaction yields a colored product and the absorbance at a given wavelength increases at 0.2 per minute. The molar absorbtivity of the product is 4.0 ?M-1cm-1. What is the rate of product formation. Use correct units.
tryptophan in the environment was exhausted, the bacteria started to excrete a metabolite on the tryptophan biosynthetic pathway. why didnt the bacteria excrete the metabolite before exhausting the environmental tryptophan?
Give the general Henderson-Hasselbalch equation and sketch the plot it describes (pH against amount of NaOH added to a weak acid). On your curve label the pKa for the weak acid, and indicate the region in which the buffering capacity of the system..
How many liters of CO2 gas at STP can be obtained by completely burning one mole of C3H8. C3H8 (g )+ 5O2 (g) -- 3CO2 (g) + 4H20 (g)
An organic substance has an enthalpy of vaporization of 29.0 kJ/mol. The compound has a vapor pressure of 524 mm Hg at 25 °C. At what temperature is the vapor pressure equal to 115 mm Hg?
Determine how much time (in seconds) is needed to form 150. g Na from a sodium chloride melt by a 25 Ampere current?
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