Multiple Choice
Given a 0.100 M solution of HClO (with Ka = 2.9 × 10^{-8}), what is the concentration of H_3O^+ in the solution?
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6. Chemical Quantities & Aqueous Reactions
Calculate Oxidation Numbers
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What is the oxidation number of bromine (Br) in HBrO_3?
A
+1
B
+3
C
+7
D
+5
Verified step by step guidance1
Identify the known oxidation numbers in the compound HBrO_3. Hydrogen (H) typically has an oxidation number of +1, and oxygen (O) typically has an oxidation number of -2.
Write the expression for the sum of oxidation numbers in the compound, which must equal zero because HBrO_3 is a neutral molecule. Let the oxidation number of bromine (Br) be x.
Set up the equation: oxidation number of H (+1) + oxidation number of Br (x) + 3 times oxidation number of O (-2) = 0, which is: \$1 + x + 3 \times (-2) = 0$.
Simplify the equation: \$1 + x - 6 = 0\(, which reduces to \)x - 5 = 0$.
Solve for x to find the oxidation number of bromine: \(x = +5\).
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