Which of the following forms a solution with a pH of 1.7?0.5

Question

0.5M solution of HCl

0.02M solution of HCl

0.02M solution of NaOH

0.6M solution of HBr

Answer 1

First of all, we know that pH = -log([hydrogen ion]). Thus, you can figure out that isolating the hydrogen ion concentration leads to 10^-pH. Furthermore, HCl is a known strong acid which fully dissociates in solution meaning we can take it as a 1:! mole ratio with hydrogen ion concentration. The -log(0.02) = 1.699 which is approximately a pH of 1.7.