Question

What is the volume ratio of nitric acid to hydrochloric acid in Aqua-regia?

• A. $1HN{O}_3+3HCl$
• B. $1HCl+3HN{O}_3$
• C. $1HCl+1HN{O}_3$
• D. $1HN{O}_3+2HCl$

Answer 1

The correct option is A $1HN{O}_3+3HCl$

Aqua regia is a mixture of hydrochloric acid (HCl) and nitric acid $\left(HN{O}_3\right)$ at a ratio of 3:1, i.e. the volume of a solution with 3 parts hydrochloric acid (HCl) added to 1 part of Nitric acid $\left(HN{O}_3\right)$.