An aqueous solution contains 0.30 M nitrous acid. One Liter of this solution could be converted into a buffer by the addition of: (Assume that the volume remains constant as each substance is added.) A. 0.31 mol NaNO2 B. 0.074 mol Ca(OH)2 C. 0.31 mol HI D. 0.30 mol NaBr E. 0.15 mol HI

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.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.