Hi... Could u guys help me to solve this question? thanks?

Which of the following are TRUE regarding buffers? (Check all that apply):


A 60/40 mixture of 1M ammonia and 1M ammonium nitrate will make a buffer.


Buffers help keep the pOH constant.


Man-made buffers were first invented by Robert Boyle.


A buffer in chemistry is a machine used to polish shoes and equipment.


Buffers are often present in biological systems.


Buffers help keep the pH constant.


A 50/50 mixture of 1M acetic acid and 1M sodium hydroxide will make a buffer.


pH buffers are added to shampoos and other cosmetic products.


Buffers are a mixture of an acid and its conjugate base in roughly equal proportions.


A 50/50 mixture of 1M acetic acid and 1M sodium acetate will make a buffer.

Hi... Could u guys help me to solve this question? thanks?
I don't know about Robert Boyle inventing buffers, and the chemistry laboratory shoe buffer is what they call a "distractor" question (ie a stupid answer).


The penultimate question misses out the very important word "weak" when it refers to an acid and its conjugate base.


Otherwise they are all true.



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