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1. Formic acid, HFor, has a Ka value equal to about 1.8 X 10^-4. A student is asked to prepare a buffer having a pH of 3.40 from a 0.10 M HFor and a 0.10 M NaFor solution. How many milliliters of the NaFor solution should she add to 20 mL of the 0.10 M HFor to make the buffer?
2. When 5 drops of 0.10 M NaOH were added to 20 mL of the buffer in problem 3, the pH went from 3.40 to 3.43. Write a net ionic equation to explain why the pH didn't go up to about 10, as it would have if that amount of NaOH were added to distilled water or to 20 mL 0.00040 M HCl, which also would have a pH of 3.40.
a gas is compressed from an initial volume of 5.60 l to a final volume of 1.23 l by an external pressure of 1.00 at
When chlorine reacts with 2-methylpropane and replaces only one hydrogen with chlorine
calculate the minimum number of grams of propane that must be combusted to provide the energy necessary to convert
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The total (inner + outer) chloride content of a second sample, weighing 0.2222 g, are titrated with 40.00mL of 0.1000M \(AgNO_{3}\) What is the ratio of moles of total chloride to mass of complex
Calculate the pH of a 3.92×10^-3 M solution of H2SO4. (Ka = 0.0120 for HSO4-) 3-In a 4.66×10^-2 M solution, a monoprotic acid, is 20.4% dissociated. Calculate Ka for this acid
Please give a balanced equation with a stepwise mechanism for the preparation of 3,4-methylenedioxychalcone from piperonaldehyde and acetophenone (with ethanol)
The flask was then shaken until the solution was uniform. A 60.0ml- sample of this glucose solution was diluted to 0.500 L . How many grams of glucose are in 100.ml of the final solution?
a patient weighs 146 pounds and is to receive a drug at a dosage of 45.0 mg per kg of body weight. the drug is supplied
A canister is filled with 310 g of ice and 100 g. of liquid water, both at 0 C . The canister is placed in an oven until all the has boiled off and the canister is empty.
Assume that the density of the mixed solutions is 1.00 g/mL, that the specific heat of the mixed solutions is 4.18 J/(g celcius), and that no heat is lost to the surroundings. The deltaHrxn for the neutralization of NaOH with H2SO4 is -114 kJ/mol ..
What volume of reduced soy sauce (575 mg Na/15 mL) would be predicted to require 25.00 mL of 1.0 M AgNO3 for titration assuming all the sodium is derived from NaCl? A.W. Na= 23
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