Rust is a reddish brown solid with the chemical formula Fe2O3 · nH2O. To determine the number of molecules of water of crystallization in a formula unit of a rust sample, 40.0 cm3 of 1.5M hydrochloric acid was added to 1.89 g of.... (Details below)?
1 Answer
Explanation:
The iron(III) oxide in the rust reacts with the acid which is INXS:
The initial no. of moles of HCl added is given by:
The unreacted HCl is titrated against 1.20 M NaOH:
From the equation we can say that:
This is the answer to the 1st part of the question.
From the equation we can say that:
Mass
The no. moles of
Ratio by moles
=
So we can write the formula:
I'll leave it unrounded as rust is not a stoichiometric compound with regard to the water present.