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A 16 ounce specialty coffee drink contains 200 mg caffeine. If all the caffeine is extracted and dissolved in an equal amount of water, what is the pH of the solution? What is the percent ionization?
Draw a diagram of a molecule of H2O ( Water), showing the outer layers and how the individual electrons are shared. 3. Why does each atom feel more stable?
calculate the theoretical mass of ca2 ion in one tablet in grams if there is 750 mg caco3 and 320mg calcium per tablet.
a pH meter measures the concentration of hydronium ions, H3O+ in solution through the creation of a concentration differential between a standard hydrogen half cell inside the pH probe and the concentration of hydronium ions outside the probe
Sodium fluoride and lead nitrate are both soluble in water. If 1.13 g of NaF and 0.232 g of Pb(NO3)2 are dissolved in sufficient water to make 1.00 L of solution, will a precipitate form?
Would a buffer containing HF and F- in appreciable quantity be expected to have a pH of around 3,5,7 or 9? Justify your answer.
the rate constant for a certain reaction is k 3.50times10-3 s-1. if the initial reactant concentration was 0.900 m
Assuming the same mass of each, which of the following substances will have the highest temperature change if they all absorb the same amount of heat Gold
Each of the four cylinders of a combustion engine has a displacement of 2.0L. If each pison in the four cylinders is displaced against a pressure of 2.0 atm and each cylinder is ignited once per second
The standard enthalpy of formation of carbon monoxide is more esothermic than the sum of the standard enthalpies of formation of methane and water.
Compare the temperature of your water bath at the time of reflux with the boiling point of your solvent
Calculate the pH of a buffer that contains 0.270 M hydrofluoric acid (HF) and 0.180 M cesium fluoride (CsF). The Ka of hydrofluoric acid is 6.8 x 10^-4.
how would you prepare 100ml of 0.5M NaOH? Calculate the mass of NaOH needed, and describe the procedure and glassware you would use.
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