Question

Classify each of the following substances as either a strong or weak acid, strong or weak base, or a soluble or insoluble salt.

Answer 1

Answer:

KOH is a strong base, $HClO_{4}$ is a strong acid, $HNO_{2}$ is a weak acid, NaBr is a soluble salt and $PbCl_{2}$ is an insoluble salt

Explanation:

According to solubility rule, all chlorides, bromides and iodides of metal ions are soluble except for $Pb^{2+},Ag^{+}$ and Hg^{+}[/tex].

Therefore NaBr is a soluble salt and $PbCl_{2}$ is an insoluble salt.

There are seven strong acids : HCl, HBr, HI, $H_{2}SO_{4}$, $HNO_{3}$, $HClO_{3}$ and $HClO_{4}$.

All group IA metal hydroxides e.g. NaOH, KOH etc. are strong base. Also, $Ca(OH)_{2}$, $Sr(OH)_{2}$ and $Ba(OH)_{2}$ are strong bases.

So, KOH is a strong base, $HClO_{4}$ is a strong acid and $HNO_{2}$ is a weak acid.