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Questions and Answers
What is the purpose of standardizing a sodium hydroxide solution?
What is the purpose of standardizing a sodium hydroxide solution?
- To determine its approximate concentration
- To prepare it directly from the solid
- To determine its exact concentration using a known acid solution (correct)
- To titrate it against an acid of unknown concentration
What is the stoichiometric equation for the titration reaction between sodium hydroxide and oxalic acid?
What is the stoichiometric equation for the titration reaction between sodium hydroxide and oxalic acid?
- (COOH)2 + NaOH → H2O + COONa
- (COOH)2 + 2NaOH → H2O + (COONa)2
- (COOH)2 + 2NaOH → 2H2O + COONa (correct)
- COOH + NaOH → H2O + COONa
Why can't a standard solution of sodium hydroxide be prepared directly from the solid?
Why can't a standard solution of sodium hydroxide be prepared directly from the solid?
- Sodium hydroxide is too expensive to use in large quantities
- Sodium hydroxide is a primary standard and cannot be prepared as a solution
- Sodium hydroxide is not a primary standard and requires titration to determine its exact concentration (correct)
- Sodium hydroxide reacts with air to form an insoluble compound
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