Diluting concentrated 1.74m acetic acid to prepare 200 ml of 8m stick solution. what volume of concentrated acid must be used

43.5 mL

We are given;

We are required to determine the volume of acid that must be used.

M1V1 = M2V2

Rearranging the formula;

V1 = M2V2 ÷ M1

   = (1.74 M × 200 mL) ÷ 8 M

   = 43.5 mL

Therefore, the volume of the concentrated acid that must be added is 43.5 mL

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.