A Student Uses 16

question 59

Multiple Choice

A student uses 16.60 mL of 0.100 M NaOH to titrate a 0.2000-g sample of an unknown acid. Which of the following acids is the unknown most likely to be? Assume that only the hydrogens bonded to oxygen are titrated by the sodium hydroxide and that, because of experimental error, the student's value may not be identical to the theoretical value.

• A) oxalic acid, HOOCCOOH, molar mass 90
• B) succinic acid, HOOCCH₂CH₂COOH, molar mass 118
• C) benzoic acid, C₆H₅COOH, molar mass 122
• D) phthalic acid, C₆H₄ (COOH)₂, molar mass 166
• E) not enough information

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Definitions:

Simplify

The process of making a situation, equation, or expression less complicated or easier to comprehend.

Imaginary Numbers

Complex numbers that have a real part of zero and an imaginary part that is not zero, represented as multiples of the square root of -1.

Complex Numbers

Numbers consisting of a real part and an imaginary part, usually expressed in the form a + bi, where 'a' and 'b' are real numbers and 'i' is the square root of -1.

Simplify

The process of reducing something to its basic or most straightforward form, often used in mathematics to reduce expressions or fractions.