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prepare a PH = 4.00 buffer staring from 1.50 L of 0.0200 M solution of benzoic acid (c6h5cooh) and an excess of sodium benzoate (C6H5COONa)
how many grams of sodium benzoate should be added to prepare the buffer?
A solution is prepared by dissolving 18.4 g ammonium sulfate in enough water to make 100.0 mL of stock solution. A 11.00 mL sample of this stock solution is added to 50.00 mL of water. Calculate the concentration of ammonium ions and sulfate ions ..
If the reaction 2H2S(g) ↔ 2H2(g) + S2(g) is carried out at 1065°C, Kp = 0.0120. Starting from pure H2S introduced into an evacuated vessel at 1065°C.
When 25.0 g of Zn reacts, how many L of H2 gas are formed at 25 °C and a pressure of 854 mmHg?
Suppose the pH of the water is 3.88 and that the concentration of iron(II) in the water is 2.30x 10-5 M, what is the potential of the corrosion reaction under the above conditions at 298 K?
what mass of stomach acid will neturalise an antacid tablet containing 0.1g of magnesium hydrogen carbonate
Calculate the pH at the following points a. Before Titration b. After the addition of 5.00mL of NaOH c. After the addition of 25.00mL of NaOH d. After the addition of 50.00mL of NaOH e. After the addition of 5.00mL of NaOH
Explain which of the following substance has the lowest melting point
Sodium reacts with flourine to produce sodium flouride. If 4.0 grams of sodium reacts with 5.0 grams of flourine, how much NaF can be produced?
The boiling point of a solution containing 10.44 g of an unknown nonelectrolyte in 50.00 g of acetic acid is 159.2°C. What is the molar mass of the solute?
The wavelength corresponding to the threshold frequency to tungsten surface is 230nm. Calculate the kinetic energy of the photoelectron ejected from the surface of tungsten metal.
She pours a 50.0 mL sample of water at 345 K into the calorimeter containing a 50.0 mL sample of water at 298 K. She carefully records the final temperature of the water as 317 K. What is the value of Ccal for the calorimeter?
An aqueous antifreeze solution is 40.0% ethylene glycol, C_2H_6O_2, by mass. The density of the solution is 1.05 g/ml. Calculate the molality of the ethylene glycol.
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