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an unknown monoprotic weak acid ha has a molar mass of 550 a solution contains 250 g of ha dissolved 800 ml of solution
what ratio ch3nh3ch3nh2 is needed to prepare a buffer solution with a ph of 860 from methylamine ch3nh2 and
an unknown monoprotic weak acid ha has a molar mass of 550 a solution contains 250 g of ha dissolved 800 ml of
the equilibrium constant for the reaction n2g 3h2g 2nh3g is kp434x10-3 at 300c pure nh3 is placed in a 100 l flask
water flows from a fire truck through a hose that is 117 cm in diameter and has a nozzle that is 2 cm in diameter the
you pull downward with a force of 241 n on a rope that passes over a disk-shaped pulley of mass 135 kg and radius 00785
a student obtained the following data from this experiment calculate the molar mass of this unkown liquidatmospheric
calculate the ph of a solution formed by mixing 1720 ml of 0100 m naf and 2010 ml of 0025 m
a projectile is fired horizontally from a gun that is 520 m above flat ground the muzzle velocity is 215 ms how long
even if two spots have the same rf value we cannot be certain that the two samples are identical compounds suggest a
you need to know the height of a tower but darkness obscures the ceiling you note that a pendulum extending from the
how many grams of kcooh are needed to prepare 150 ml a buffered solution of ph 385 if the acid concentration hcooh is
a solenoid with a cross-sectional area of 188times10-3 m2 is 0760m long and has 445 turns per meter find the magnitude
a stationary railroad whistle is sounded an echo is heard 50 seconds later by the trains engineer if the speed of sound
an iron casting containing a number of cavities weighs 169677 n in air and 130458 n in water what is the total volume
if you have 50 ml of a buffered solution of 015m hno2 and 005m nano2 how many ml of 02m hcl can you add before the ph
you want to prepare 250 ml of buffered solution composed of nh3 and nh4cl with a ph of 101 if you start with 250 ml of
you have 200ml of a solution which is 02m nh3 and contains 023grams of nh4cl a what type solution is it b what is the
it is possible to make a thermometer by sealing gas in a rigid container and measuring the absolute pressure such a
on average each person in the industrialized world is responsible for the emission of 10000 kg of carbon dioxide every
if you have a solution of 015 m solution of hc2h3o2and 013m nac2h3o2 a what type solution is it b what is the
for a 025m solution of hf a write the ionization equation b what will be the concentration of all species present
if you have 100 ml of pure water and add to it 100 ml of 20m hc2h3o2 what will be the final solution
if you have 100 ml of pure water and add to it 10 ml of 20m hno3 what will be the ph of the final
what is the ph and the oh- of the solutions with the following h3o a 23 x10-4 b 48 x10-8 c 63