which of these substances has the lowest ph?\no 0.5 m hbr, poh = 13.5\no 0.05 m hcl, poh = 12.7\no 0.005 m…
which of these substances has the lowest ph?\no 0.5 m hbr, poh = 13.5\no 0.05 m hcl, poh = 12.7\no 0.005 m koh, poh = 2.3
Answer
Explanation:
Step1: Recall pH - pOH relationship
We know that $pH + pOH=14$.
Step2: Calculate pH for 0.5 M HBr
Given $pOH = 13.5$, then $pH=14 - pOH=14 - 13.5 = 0.5$.
Step3: Calculate pH for 0.05 M HCl
Given $pOH = 12.7$, then $pH=14 - pOH=14 - 12.7 = 1.3$.
Step4: Analyze 0.005 M KOH
KOH is a base. Given $pOH = 2.3$, then $pH=14 - pOH=14 - 2.3 = 11.7$.
Answer:
$0.5\ M\ HBr, pOH = 13.5$