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Explain the pH of a buffer system that contains 0.210 M hydrocyanic acid (HCN) as well as 0.160 M sodium cyanide (NaCN)? The pKa of hydrocyanic acid is 9.31.
what is the masss concentration of water vapor in the atmosphere at 25 degrees celcius when the realtive humidity is 60
Give the formulas of all new molecules or ions formed when solutions of the following are mixed. If there is no reaction write "N.R." (a) Cl-, Br- , I-, Fe3+ (b) Fe2+, Br2 water
Calculate the change of entropy for the system when 2.00 moles of a diatomic ideal gas is changed from 25 degrees celsius and 1.5 atm to 135 degrees Celsius
Find the conditional formation constant for Ca(EDTA)2- at pH 9.00, where log Kf is 10.65 and ?Y4- is 0.041.
A 50.0-mL volume of 0.15 M HBr is titrated with 0.25 M KOH . Calculate the pH after the addition of 20.0 mL of KOH.
Calculate the catalytic efficiency of lysozyme (in units of M-1 s-1), in terms of the rate of encounter of enzyme with substrate. How does this value compare to the diffusion-limited value of k1 = 109 M-1 s-1?
Calculate the molarity of a 31.45 weight percent acidity% muriatic acid solution given that the solution density is 1.17 g ml
The standard enthalpy and entropy for a slightly soluble salt at 25 degrees C were determined to be 36 kJ and 47 J/K respectively. Calculate the standard Gibbs Free Energy for this salt.
Determine what is the total mass of glucose in 5.10L of blood If a person has a glucos level of 108 mg.100mL, ? express your answer in grams?
Write the overall balanced equation of potassium permanganate with sodium oxalate in acidic solution using the half reaction method. Indicate the oxidation states for each species as well as the oxidizing agent and reducing agent.
the structures of the ions Ni2+ (aq) and Fe3+ (aq) as they exist in aqueous solution in octahedral shape.
What mass of Al2O3 in grams can be made by reaacting 4.6 g AL with excess oxygen?
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