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The antibacterial agent sulfamethoxazole is an unionized acid with a pKa of 5.0. What is the ratio of this drug in buffered gastric fluid of pH 3.0? What is the percent ionized to unionized
a 250ml solution of NaOH has 20g of solute. what is the concentration in moles per litre? what is the concentration of each ion?
what is the formula for the ion formed when each of the following elements loses its valence electrons.
A flask containing 450 mL of 0.47 M H2SO4 was accidentally knocked to the floor. How many grams of NaHCO3 do you need to put on the spill to neutralize the acid according to the following equation?
* State what the patient can include and avoid in her diet on a regular basis to avoid these symptoms in the future.
Consider the reaction that occurs when a solution containing hydrochloric acid (HCl) is added to a solution containing the weak base methylamine (CH3NH2).
The density of citronellal, a mosquito repellant, is 1.45 g · L-1 at 365C and 50.0 kPa. What is the molar mass of citronellal?
The heat of vaporization of CCl2F2 is 289 J/g. What mass of this substance must evaporate to freeze 165 g of water initially at 15°C? (The heat of fusion of water is 334 J/g; the specific heat of water is 4.18 J/g-K.)
If 10500 L H2 gas is reacted with an excess of N2 gas at 200 atm. and 500 C, how many moles of ammonia gas would be produced, assuming a 15% yield?
What mass of sodium chloride, NaCl, is needed to make 389. g of a 3.89%(m/m) NaCl solution? (atomic masses: Na = 22.99, Cl = 35.45)
A student collected hydrogen in a eudiometer as described above. Barometric pressure is 765.5 Torr, the vapor pressure of water is 22.0 Torr at this temperature and the solution remaining in the eudiometer is 5.75 cm above the water in the beaker
Calculate the radiation dosage (in grays) for an 57-kg person that is exposed for 3.0 seconds to a 3.0 Ci source of beta radiation.
Provide an explanation on why the methylene unit between the two carbonyl groups is more acidic than each of the methyl groups in acetylacetone. In the reaction conditions, what is the base responsible for the deprotonation of acetylacetone
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