Question

Question #e2aa3

Answer 1

Hydrogen ions are released when `HNO_3` is added to pure water.

This is determined by looking at the ions that are present in each of these compounds. In order for hydrogen ions to be released, `H+` must be one of the ions present in the compound. since choices 1 & 2 do not even have an H in their formula, they cannot be correct.

Looking at choice 3 & 4, both have an H in the formula. However, the H in number 4 is in the form of a hydroxide ion, `OH^-`. When `KOH` splits apart, it will form `K^+` & `OH^-` ions.

Choice 3 will dissociate into `H^+` and `NO_3^-` ions. Thus, choice 3 is the only one that will produce `H^+` when added to pure water.