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1. If you wish a buffer to have a pH of 10.00, what is the desired [H3O+]?
2. In the buffer from 6, you want to select a weak acid (one of the conjugate pair) with a Ka close to that value of [H3O+]. Explain why, using the expression for Ka.
Every Ka is for a reaction HA (aq) + H2O (l) ↔ H3O+ (aq) + A? (aq).
a) Write the chemical equilibrium for the acid H2CO3 for which the equilibrium constant is the Ka of carbonic acid.
b) Write the expression for the Ka for the reaction of carbonic acid with water.
c) If the patient's pH is 7.30, calculate [H3O+]
How many mL of a 0.175M solution of NaOH (aq) will react with 150.0 mL of a 0.158 M H3PO4 (aq) solution?
Trimix gas is used for very deep diving. It is composed of three gases, usually helium, nitrogen and oxygen. The composition is denoted as percentage of oxygen / percentage of helium
7. 0.500 g each of hydrogen, H2, and carbon monoxide, CO, are introduced into an evacuated 250. mL flask. What will be the total pressure (in atm) in the flask at 22ºC? How much of the pressure will be due to hydrogen
The decomposition of N2O5 in CCL4 is a first order reaction. If 2.56 mg of N2O5 is present initially and 2.50 mg is present after 4.26 minutes at 55 degrees Celsius what is the value of the rate constant K?
The value of delta H for 2CO(g) + O2 (g) = 2CO2(g) is -482 kJ. Calculate the heat released to the surroundings when 38.5 g of O2 (g) reacts with excess CO
The flask was then shaken until the solution was uniform. A 25.0-sample of this glucose solution was diluted to 0.500 . How many grams of glucose are in 100. of the final solution?
You have separate solutions of HCl and H2SO4 with the same concentrations in terms of molarity. You wish to neutralize a solution of NaOH. Which acid solution would require more volume (in mL) to neutralize the base
Consider the following data and select the best buffer system below to make a buffer with a pH of 10.00.
how many moles of phosphine ph3 are produced for every 4.0 moles of hydrogen that react according to the chemical
What is the final temperature in a squeezed cold pack that contains 50.0 g of NH4NO3 dissolved in 135 mL of water?
A gas confined in a 519.1-mL container exerts a pressure of 107 mm Hg at 38.6 degrees Celsius. At what Celsius temperature will it exert a pressure of 635.7 mm Hg if it is placed into a 644 mL container?
A student accidentally mixed small pure white crystals of napthalene into a small vial containing small white crystals of disodium malonate. What can she do to purify the disodium malonate away from the naphtalene quickly
RNA is readily hydrolyzed by alkali, whereas DNA is not. Why. Think of pH required for nucleophile generation
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