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Tris base (pKa=8.1) was dissolved in .5L of water to give the final concentration of 1 M. How much does the pH change after addition of 1mL of 10N HCL?
Carbon-14 has a half-life of 5730 years. Currently living organisms decay at a rate of 15.3 disintegrations/min per gram of carbon.
Using the quadratic equation to calculate H3O+ in 0.00250 M HNO2. what are the values of a,b,c, and x. Recall that Ka=4.5 x 10^4
A cylindrical vessel with rigid adiabatic walls is separated into two parts by a frictionless adiabatic adiabatic piston. Each part contains 50.0L of an ideal monatomic gas with Cv = 3R/2. Initially, Ti = 325K and Pi = 2.50x10^5 Pa in each part.
0,245g of the carbonate was found to exactly neutralise 23,6cm3 of HCl with a concentration of 0,150 mol/dm3.
What is the pH at the equivalence point. f) What indicator would be most suitable for this titration. g) What is the pH when 105% of the required base has been added
Write the chemical equation and the Kb expression for the reaction of each of the following bases with water: ammonia, NH3; hydrogen sulfide, HS- ; hypochlorite ion, ClO-
If the symbol X represents a central atom, Y represents outer atoms, and Z represents lone pairs on the central atom, the structure that could be abbreviated as XY2Z2.
A biochemist studying the break down of insecticide DDT finds that it decomposes by a first-order reaction w/ a half-life of 12 years. How long does it take DDT in the soil sample to decompose from 2.40 x10^2ppbm to 10. ppbm (parts per billion by ..
What is the pressure (in atm) inside a container of gas connected to a mercury filled open-end manometer when the level in the arm connected to the container is 28.3cm higher than the level in the arm open to the atmosphere,
What is the concentration of a solution of lithium carbonate containing 0.01 mol in 750 mL of solution? Give your answer to two significant figures and include the units as mol L-1 ie 0.36 mol L-1
A gas is placed in 1.23 L sealed container at a pressure of 0.500 atm and a temperature of 23.0 C. The temperature of the container is increased to 100.0 C.
a mixture of 70 mole propane and 30 mole hydrogen is burned with 30 excess air. fractional conversions of 90 of the
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