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A buffer containing 0.25 M NH3 (Kb = 1.8 x 10-5) and 0.40 M NH4Cl is prepared. a. What is the pH of this buffer solution? b. What is the pH of the solution after 25.00 mL of 1.00 M HCl is added to 975.0 mL of buffer?
What is the reaction between four carbons with the triple bond on the third and fourth ones and HCl? Then what reaction is that product and HBr
A chemist wanted to determine the concentration of a solution of lactic acid, HC3H5O3. She found that the pH of the solution was 2.49. What was the concentration of the solution? The Ka of lactic acid is 1.4 10-4.
A solution of ethanol (C2H5OH) in water is prepared by dissolving 56.0 mL of ethanol (density = 0.79 g/cm3) in enough water to make 255.0 mL of solution. What is the molarity of the ethanol in this solution?
Milk of magnesia is often taken to reduce the discomfort associated with acid stomach or heartburn. The recommended dose is 1 teaspoon, which contains 4.00×102mg of Mg(OH)2.
If 200 g of water at 20 degrees celcius absorbs 41840 J of energy, what will its final temperature be
A solution is made by mixing 49.0 mL of ethanol, C2H6O, and 51.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 degrees celcius
An unknown compound contains carbon, hydrogen, oxygen, and sulfur atoms. When a 10.00 mg sample of the unknown compound was combusted, it produced 16.27 mg of CO2, 5.55 mg of water, and 7.90 mg of SO2. What is the empirical formula of the unknown ..
You are testing some novel fuel mixtures for potential use in automobiles. Your testing apparatus is a 2.54-cm inner diameter cylinder fitted with a piston, designed to mimic a cylinder found in a car engine.
Which of the following gases deviate most from behavior of ideal gas: CO2, O2, He, N2, CH4
If, in a certain experiment, over a specific time period, 0.0055 mol PH3 is consumed in a 2.3 L container during each second of reaction,
Determine the heat that must be extracted to cool the gas from 375 C to 275 C at (a) Constant Pressure and (b) constant volume.
find the mass of C3H8 required to generate 2.5x10^8 KJ of energy when combusted with O2 gas to produce CO2 gas and water vapor.
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