Answer: Option (A) is the correct answer.
Explanation:
Arrhenius acids are the species which dissociate to give hydrogen ions, that is, .
For example,
In the given example, HCN is donating the hydrogen ion therefore, it is an acid whereas is accepting the hydrogen ions so it acts as a base.
Whereas according to Arrhenius, bases are the species which dissociate to give hydroxide ions, that is, .
For example,
Thus, we can conclude that the statement only positive ion in solution is best describes the solution produced when an Arrhenius acid is dissolved in water.
6.02x10^22 is one mole, so we can just say it's 1 mol HCl in 2.0 L of water. Molarity is mol/L, so 1 mol/2 L is 0.5 mol/L or 0.5 M. Make sense?
Acetone (systematically named propanone)