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A 0.00445 mol sample of a weak acid, HY, is dissolved in enough water to form 0.0976 L of solution. If the pH of the solution is 4.02, what is the Ka of HY? Use E notation with 3 significant figures.
As a technician in a large pharmaceutical research firm, you need to produce 450. of 1.00 potassium phosphate buffer solution of = 7.38. The of is 7.21. You have the following supplies: 2.00 of 1.00 stock solution
Calculate the hydrogen Ion concentration, in moles per liter, for solutions with each of the following pH values.
A 17.0-g sample of ice at -19.0°C is mixed with 101.0 g of water at 87.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
Compound A has the molecular formula C14H25Br and was obtained by reaction of sodium acetylide with 1,12-dibromododecane. On treatment of compound A with sodium amide
The concentration of sugar (glucose, C6H12O6) in human blood ranges from about 80 mg/100 mL before meals to 120 mg/100 mL after eating.
How much work is done reversibly compressing one mole of an ideal gas from a starting volume of 1L to a final volume of 250mL at a constant temperature of 293K? What is the change in entropy?
Write the chemical equation for all the reactions both SN1 and SN2 involving primary and secondary substrates b) Rank the primary halide in order of increasing reactivity toward SN2
Solve an equilibrium problem (using an ICE table) to calculate the pH of each solution:a solution that is 0.165M in HC 2 H 3 O 2 and 0.120M in KC 2 H 3 O 2.
Determine the quantity of stock 75% EtOH required to prepare 300ml of a 25% EtOH solution.
how many grams of methylamine must be combusted to raise the temperature of 431 g of water from 11.0 degrees Ce to 41.0 degrees C?
A 98 L sample of dry air cools from 138°C to -30.°C while the pressure is maintained at 2.85 atm. What is the final volume?
What weight of A would be removed from the same solution by successive extraction with four portions of 25mL of hexanes? How much hexanes would be required to remove 98.5% of A in single extraction?
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