A Student Discovers a Bottle of NaOH with a Partially

question 24

Multiple Choice

A student discovers a bottle of NaOH with a partially destroyed label. How can the concentration be determined without using a pH meter?

• A) The student can set-up a titration experiment, where a standardized HCl solution is used to titrate the NaOH. The moles of H⁺ and OH^- are equal at the equivalence point, therefore, the concentration of NaOH can be calculated.
• B) The student can set-up a titration experiment, where a standardized HCl solution is used to titrate the NaOH. The pH at the equivalence point should be 7 since this is a neutralization reaction, therefore, the concentration of NaOH is 1 x 10^-7 M.
• C) The student can set-up a titration experiment, where a standardized NaOH solution is used to titrate HCl. The moles of H⁺ and OH^- are equal at the equivalence point, therefore, the concentration of NaOH can be calculated.

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