Select the statements that describe a method which can be used to make a buffer. partially neutralize a strong base solution by addition of a strong acid. add appropriate quantities of weak acid and its conjugate base to water. partially neutralize a weak base solution by addition of a strong acid. partially neutralize a strong acid solution by addition of a strong base. partially neutralize a weak acid solution by addition of a strong base.

Add appropriate quantities of weak acid and its conjugate base to water

Explanation:

the answer is a and have a great day

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.