Astudent is asked to make 500 ml of a buffer solution for an upcoming laboratory investigation that requires 50.0 ml of 3.0 m phosphoric acid. the student searches the acid cabinet in the stockroom but can only find 4.5 m phosphoric acid. calculate the amount of 4.5 m phosphoric acid the student should dilute to a total volume of 500 ml. give our answer to the nearest tenth of a ml.

To solve this we use the equation, 

M1V1 = M2V2

where M1 is the concentration of the stock solution, V1 is the volume of the stock solution, M2 is the concentration of the new solution and V2 is its volume.

4.5 ( V1 ) = 3.0 ( 500 mL )

V1 = 333.33 mL needed of the 4.5 M phosphoric acid

Hope this answers the question. Have a nice day.

false

because it does not have the potential to be entirely used up

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.