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How many grams of formic acid, HCOOH, must be added to 0.210 L of 0.160 M sodium formate, HCOONa, to yield a buffer solution with a pH of 4.10? Assume no volume change. Ka of HCOOH = 5.0 10-4.
What mass of NaCl must be dissolved in 65.0 grams of water to lower the freezing point by 7.50 °C? The freezing point depression constant, Kfp, for water is -1.86 °C/m.
A container with a volume of 101 L contains how many atoms of argon gas at STP?
Calculate the equilibrium concentrations of NH3 and H2S if a sample of solid NH4HS is placed in a closed vessel and decomposes until equilibrium is reached
The Henry's Law Constant for O2 in water at 20 C is 1.28x10-3mol/(L atm). How many grams of O2 will dissolve in 2.0L of H2O that is in contact with air where partial pressure of O2 is 0.209atm?
The vapor pressure of a liquid chloroform, CHCl3, is 400.0 torr at 24.1 c and 100.0 torr at -6.3C , what is Hvap of chloroform
how many grams of KOH are present in 32.5mL of a 6.42 M KOH solution
What is the molarity of a solution that contains 35.0 g of vitamin B1 hydrochloride (molar mass = 337 g/mol ) in 110 g of solution?
If the pressure exerted by ozone, O3, 3.0x10-3 atm and the temperature is 247 K , how many ozone molecules are in a liter.
Concentration of a Species, One mole of NOCl gas is added to a 4.0L container. The NOCl undergoes slight decomposition to form NO gas and Cl2 gas.
A solution of ethanol (C2H5OH) in water is prepared by dissolving 63.4 mL of ethanol (density = 0.79 g/cm3) in enough water to make 250.0 mL of solution.
The pKa of acetic acid, HC2H3O2, is 4.76. A buffer solution was made using an unspecified amount of acetic acid and 0.30 mol of NaC2H3O2 in enough water to make 1.50 L of solution.
An aqueous solution is 1.00% NaCl by mass. Its density is 1.071 g/mL at 25°C. The observed osmotic pressure of this solution is 7.83 atm at 25°C.
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