How is the limiting reactant determined in the experiment?

Question

Chemistry

Slade Golden

26 February, 03:20

How is the limiting reactant determined in the experiment?

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Myles Blackwell · Answer 1

Answer is: the limiting reactant determines t he amount of product formed.

For example:

Chemical reaction: 2AgNO₃ (aq) + K₂CrO₄ (aq) → Ag₂CrO₄ (s) + 2KNO₃ (aq).

c (AgNO₃) = 0.220 M.

V (AgNO₃) = 0.0351 L.

c (K₂CrO₄) = 0.420 M.

V (K₂CrO₄) = 0.052 L.

n (AgNO ₃) = c (AgNO₃) · V (AgNO₃).

n (AgNO ₃) = 0.220 M · 0.0351 L.

n (AgNO ₃) = 0.0078 mol; limiting reactant.

n (K ₂CrO₄) = 0.420 M · 0.052 L.

n (K ₂CrO₄) = 0.022 mol.

From chemical reaction: n (AgNO ₃) : n (Ag₂CrO₄) = 2 : 1.

n (Ag ₂CrO₄) = 0.0078 mol : 2.

n (Ag ₂CrO₄) = 0.0039 mol.

m (Ag ₂CrO₄) = 0.0039 mol · 331.73 g/mol.

m (Ag ₂CrO₄) = 1.29 g.