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10 mL of 1.0 M aqueous solution of Br(2)...

10 mL of `1.0` M aqueous solution of `Br_(2) ` is added to excess of NaOH in order to disproportionate quantitatively to `Br^(-) " and " BrO_(3)^(-)` . The resulting soluting is made free from `Br^(-) ` ion by extraction and excess of `OH^(-)` neutralized by acidifying the solution. This solution requires `1.5 ` g of an impure `CaC_(2)O_(4)` sample for complete redox change . Calculate % purity of `CaC_(2)O_(4)` sample.

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To solve the problem step by step, we will follow the chemical reactions and calculations involved in determining the percentage purity of the impure calcium oxalate sample. ### Step 1: Write the Reaction The reaction between bromine (Br₂) and sodium hydroxide (NaOH) can be represented as: \[ 3 \text{Br}_2 + 6 \text{OH}^- \rightarrow 5 \text{Br}^- + \text{BrO}_3^- + 3 \text{H}_2\text{O} \] ### Step 2: Calculate Moles of Br₂ We have a 10 mL solution of 1.0 M Br₂: ...
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