Answer:
A. 0.31 mol NaNO2
Explanation:
Buffer solutions are the solutions that resist changes in pH on addition of small amount of acid or base.
Buffer solutions usually contain the mixture of a weak acid and its salt, or a weak base and its salt.
Among the options listed in the question, only NaNO2 is the salt formed from the nitrous acid.
Answer: Option (a) is the correct answer.
Explanation:
A weak acid is defined as an acid that dissociates partially when dissolve in water or a polar solvent.
For example, acetic acid is a weak acid and when dissolved in water it dissociates partly into ions as follows.

And, a strong acid is defined as an acid which when dissolved in water dissociates completely into ions.
For example, HCl is a strong acid and when dissolved in water it dissociates completely.

Thus, we can conclude that the statement a weak acid solution consists of mostly non-ionized acid molecules, is true.
Answer:
chemical change bcoz it cannot be in the past form
Answer:
i love adding salt to my hypothesis
Explanation:
Examples of Secondary Pollutants
Smog and acid rain are produced through similar sources, primarily vehicle and industry emissions. Though both result from human-caused air pollutants, there are chemical distinctions between the two.
hope it helps....!!!