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A buffer solution is prepared by dissolving 1.50g each of benzioc acid C6H5CO2H and sodium benzoate NaC6H5CO2 in 150.0mL of solution.
a) What is the pH of this buffer solution?
b) Which buffer component must be added and what quantity is needed to change the pH to 4.00?
c) What quantity of 2.0M NaOH or 2.0M HCl must be added to the buffer to change the pH to 4.00?
Consider the following data: expect a BeF2 molecule to be linear but an SF2 molecule to be angular. Explain the decreasing melting point from NaF to Nai.
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.
The selenite ion is an oxoanion of selenium bearing a negative two charge and containing three oxygen atoms. Write the formula for the selenite ion.
Light with a frequency of 7.11 x 10 -14 Hz lies in the violet region of the visible spectrum. What is the wavelength of this frequency of light? Answer in units of nm.
A reaction between methane and hydrogen sulfide to produce carbon disulfide and hydrogen gas was carried out. CH4 (g) + 2 H2S(g) → CS2 (g) + 4 H2 (g)
Calcium carbide reacts with water to form acetylene and calcium hydroxide. From the following enthalpy data calculate Delta Hf for CaC2
A sample of gas is collected over water at a temperature of 35.0C when the barometric pressure reading is 707 torr. What is the partial pressure of the dry gas, given PH2O = 42.2 torr?
A beaker contains 0.964 grams of nitrogen. How many moles of molecular nitrogen does the beaker contain?
Working with ideal gas law, The pressure of a sample of gas at a constant temperature of 25 degrees C is increased from 1.0atm to 1.3atm
At 25 oC the solubility of copper(II) iodate is 3.27 x 10-3 mol/L. Calculate the value of Ksp
A 5.0 ml sample of vinegar was titrated with 7.2 ml of 0.55 M NaOH. if the density of vinegar solution is 1.00g/ml, what is the mass percent of acetic acid present.
A solution containing 16.9 g of nonvolatile molecular compound in 250. g of water has a freezing point of -0.744°C. What is the molar mass of the substance?
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