A Student Discovers a Bottle of a Highly Corrosive Monoprotic

question 31

Multiple Choice

A student discovers a bottle of a highly corrosive monoprotic acid with the label partially destroyed. How can the concentration of the unknown acid be determined without using a pH meter?

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