Reaction of Iron with Concentrated and dilute hydrochloric acid Does Iron react differently with dilute and concentrated hydrochloric acid?
A. I know that with dilute hydrochloric acid Iron (II) chloride is formed.
B. I read on the internet that with concentrated hydrochloric acid Iron reacts to form Iron (III) Chloride.
Could someone tell me:
1. Is FeCl3 formed as a product of reaction between HCl (conc.) and iron?
2. If yes, then what is the complete chemical reaction?

Thank you.
No, $\ce{FeCl3}$ is not formed upon reaction with Conc. $\ce{HCl}$. Both dilute and concentrated $\ce{HCl}$ give $\ce{FeCl2}$ as product.

$$\ce{Fe + 2HCl_{dil} -&gt; Fe^2+ +  2Cl^- + H2 ^}$$
$$\ce{Fe + 2HCl_{conc} -&gt; Fe^2+ +  2Cl^- + H2 ^}$$

Source: Vogel's Qualitative Inorganic Analysis