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What is the pH of a buffer prepared by adding 0.809 of the weak acid HA to 0.305 of NAH in 2.00 L of solution? The dissociation constant Ka of HA is of is (5.66 X 10^{-7}). Express the pH numerically to two decimal places.
For the following processes, calculate the change in internal energy of the system and determine whether the process is endothermic or exothermic:
What is the pH of the buffer that results when 11 g of NaCH3CO2 is mixed with 85 mL of 1.0 M CH3CO2H and diluted with water to 1.0 L? (Ka of CH3CO2H = 1.8 ´ 10-5)
If the ion of element X has a mass number of 230 and has 86 electrons, what is the identity of the element? How many neutrons does it have?
If 17.9 mL of 0.800 M HCl solution are needed to neutralize 5.00 rm mL of a household ammonia solution, what is the molar concentration of the ammonia.
Given that Kp for 2SO2(g)+O2(g)=2SO3(g) equals 3.18 at 1000K. Figure out what must be the value of Kc for this same equilibrium.
An aqueous solution containing 0.003 M NaCl and 0.005 M CaCl2 is mixed with the polysaccharide alginate to create a high-viscosity liquid that is a component of a wound dressing
Identify all of the substances that are used or produced in this experiment A5. Distinguish between elements and compounds.
Draw the Newman projection formulas for CH3CHBrCH2CH3 and sketch the potential energy versus rotation diagram for a 360o rotation of 2-bromobutane along C2 and C3 carbon atoms.
The solubility product of Mg(OH)2 is 1.2E-11. What minimum OH- concentration must be attained (for example, by adding NaOH) to decrease the Mg2+ concentration in a solution of Mg(NO3)2 to less than 1.9E-10 M?
Order these five gases that occur in the troposphere from most abundant to least abundant: Rn, CO2, CO, N2, Ar and O2.
Describe how and why the ferric chloride test can be used to detect whether your reaction has gone to completion.
The cell potential of the following electrochemical cell depends on the gold concentration in the cathode half-cell: Pt(s) | H2(g,1atm) | H+(aq,1.0M) | Au3+(aq,?M)|Au(s).
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