If all of the chloride in a 3.734-g sample of an unknown metal chloride is precipitated as agcl with 70.90 ml of 0.2010 m agno3, what is the percentage of chloride in the sample?

Question

Chemistry

Zane Zhang

26 August, 13:58

If all of the chloride in a 3.734-g sample of an unknown metal chloride is precipitated as agcl with 70.90 ml of 0.2010 m agno3, what is the percentage of chloride in the sample?

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Wade Johnston · Answer 1

Answer is: the percentage of chloride in the sample is 13.53%.

Balanced chemical reaction: MCl + AgNO₃ (aq) → AgCl (s) + MNO₃ (aq).

V (AgNO₃) = 70.90 mL : 1000 mL.

V (AgNO₃) = 0.0709 L; volume of silver nitrate.

c (AgNO₃) = 0.2010 M; molarity of the solution.

n (AgNO₃) = V (AgNO₃) · c (AgNO₃).

n (AgNO₃) = 0.0709 L · 0.201 mol/L.

n (AgNO₃) = 0.0143 mol; amount of silver nitrate.

From chemical reaction: n (AgNO₃) : n (MCl) = 1 : 1.

n (MCl) = 0.0143 mol; amount of the sample.

M (MCl) = m (MCl) : n (MCl).

M (MCl) = 3.734 g : 0.0143 mol.

M (MCl) = 261.11 g/mol; molar mass of the sample.

ω (Cl) = M (Cl) : M (MCl) · 100%.

ω (Cl) = 35.45 g/mol : 261.11 g/mol · 100%.

ω (Cl) = 13.53 %.