Consider the reaction: HNO3(aq) + Ba(OH)2(aq) → ?. What is the formula for the salt that forms in this reaction?

• A. NaNO3
• B. BaSO4
• C. Ba(NO3)2
• D. BaCl2

Answer: (C)

Verified step by step guidance

1. Identify the reactants: HNO3 (nitric acid) and Ba(OH)2 (barium hydroxide), which is a base.
2. Recognize that this is an acid-base neutralization reaction where the acid's hydrogen ion (H\^+) reacts with the base's hydroxide ion (OH\^-) to form water.
3. Determine the ions involved: HNO3 dissociates into H\^+ and NO3\^- ions; Ba(OH)2 dissociates into Ba\^{2+} and 2 OH\^- ions.
4. Since Ba\^{2+} has a charge of +2 and nitrate (NO3\^-) has a charge of -1, the salt formed will combine one Ba\^{2+} ion with two NO3\^- ions to balance the charges, resulting in Ba(NO3)2.
5. Write the complete balanced reaction: HNO3 + Ba(OH)2 → Ba(NO3)2 + H2O, confirming the salt formed is barium nitrate, Ba(NO3)2.