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Consider a mixture of salt NaA and weak acid HA. Please derive the pH Henderson Hasselback equation by writing the equilibrium expression. Define the pKa. Hint: What is a buffer? Another hint: what happens when you add strong acid or base to a buffer solution? NaA(s) ---> Na+ (aq) + A-(aq) HA(aq) <---> H+ + A-(aq)
when 0.500 l of a 2.00 m solution of Pb(NO3)2 is mixed with an excess of 1.00m solution of Ki, how many grams lead (II) iodide are formed? ( molar mass: Pb(NO3)2= 331 g;KI 166g; PbI2 =467 g; KNO = 101 g
Fill in the missing mass number and atomic number for each of these particles or types of radiation
Explain how does unique physical and chemical properties of water contribute to significance of water for life on Earth to survive.
A patient weighs 165 pounds and is to receive a drug at a dosage of 45.0 mg per kg of body weight. The drug is supplied as a solution that contains 25.0 mg of drug per mL of solution. How many mL of the drug should the patient receive?
The eamount of cadmium in a sample was determined using absorption spectroscopy as an analytical tecnique. Signals from a set of standards were measured and the resulting calibration curve was fit by a straight line with equation
Given the following equilibrium constant at 25 C, calculate the equilibrium constant for the unknown reaction below.
Analyzing a new reaction Consider the following elementary steps that make up the mechanism of a certain reaction: 2X -> Y + Z Y + L -> M + Z Part A What is the overall reaction
There is a mixture that is soluble only in methylene chloride. I wanna run the column in 10% Ethyl acetate/hexanes. Which method of column loading should I use in this case and why?
Determine the empirical formula of estradiol. The molecular weight of estradiol was later determined to be 272. Determine the molecular formula of estradiol.
What is the vapor pressure of a solution which contains 0.550 moles of acetonitrile and 0.350 moles of acetone? Assume the mixture behaves as an ideal solution.
25.0 mL of 1.00 M HCl at 24.3oC react with 25.0 mL 1.00 M NaOH in a styrofoam calorimeter whose calorimeter constant is 70 J/C. The final temperature is 31.8o C. Assume the density of the solution product is 1.00 g/mL and the specific heat of the ..
If there are 0.640 g of NaCl left in a beaker that originally contained 75.0 mL of saltwater, what must have been the molar concentration of the original solution? The molar mass of NaCl is 58.44 g/mol.
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