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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Definitions:

Quadratic Form

An expression in which the highest power of variables is squared, typically written in the form ax^2 + bx + c.

Square Root Property

A principle stating that for any positive number x, there exists a positive and negative value whose square equals x.

Square Root Property

Refers to a principle used to solve quadratic equations, stating that if \( x^2 = a \), then \( x \) is equal to both the positive and negative square root of \( a \).

Complex Solutions

Solutions to equations that include imaginary numbers, typically used when solving polynomial equations that do not have real-number solutions.