A Certain Rust Remover Containing Phosphoric Acid Has a Density

question 77

Multiple Choice

A certain rust remover containing phosphoric acid has a density of 1.685 g/mL.Titration of a 59.3 mL sample of the rust remover requires 1.40 L of 1.86 M NaOH to completely react with the acid to form sodium phosphate.What is the mass percent H₃PO₄ (98.0 g/mol) in the rust remover?

• A)14.6%
• B)19.8%
• C)39.1%
• D)69.7%
• E)85.1%

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