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Lesson 3: Quantitative Chemical Analysis – Volumetric and Gravimetric Methods — Picture questions (exam style)

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1.
A 1.4 g sample is dissolved and its Br− precipitated as AgBr; the dried precipitate is 1.75 g (see diagram). Find the % of Br− in the sample.
A 1.4 g sample is dissolved and its Br⁻ precipitated as AgBr; the dried precipitate is 1.75 g (see diagram). Find the % of Br⁻ in the sample.
106 %
53.2 %
42.6 %
125 %
2.
0.5 g of AgCl precipitate forms. What mass of Cl− does it contain?
0.5 g of AgCl precipitate forms. What mass of Cl⁻ does it contain?
0.124 g
0.500 g
0.247 g
2.02 g
3.
2.4 g of Fe₂O₃ precipitate forms. What mass of Fe does it contain?
2.4 g of Fe₂O₃ precipitate forms. What mass of Fe does it contain?
3.36 g
2.40 g
3.43 g
1.68 g
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