Question

Which of the following are arrhenius acids? a. h2o b. ca(oh)2 c. h3po3 d. hi

Answer 1

Ca(OH)2 is an Arrhenius base and HI is an Arrhenius acid.

Step-by-step explanation:

An Arrhenius acid is a compound that increases the concentration of H+ ions in aqueous solution. Arrhenius bases, on the other hand, increase the concentration of OH- ions in aqueous solution.

Among the given options, H2O is neither an acid nor a base as it does not increase the concentration of H+ or OH- ions. Ca(OH)2 is an Arrhenius base as it dissociates into Ca2+ and 2 OH- ions in water, increasing the concentration of OH- ions. HI is an Arrhenius acid as it dissociates into H+ and I- ions in water, increasing the concentration of H+ ions.

Answer 2

The Arrhenius acids among the given options are
`\(H_3PO_3\)` (c) and
`\(HI\)` (d).

Arrhenius acids are substances that, when dissolved in water, increase the concentration of hydronium ions
`(\(H_3O^+\))`. Let's evaluate the options:

a.
`\(H_2O\)` (water) - Water itself can act as both an acid and a base, but it does not significantly increase
`\(H_3O^+\)` concentration when pure. It is considered amphoteric, not a typical Arrhenius acid.

b.
`\(Ca(OH)_2\)` (calcium hydroxide) - This is a base because it dissociates in water to produce hydroxide ions
`(\(OH^-\))`, not
`\(H_3O^+\)`. It is not an Arrhenius acid.

c.
`\(H_3PO_3\)` (phosphorous acid) - This is an acid as it can donate a proton
`(\(H^+\))` in water. It is an Arrhenius acid.

d.
`\(HI\)` (hydroiodic acid) - This is an acid as it readily dissociates in water to produce
`\(H_3O^+\)` and
`\(I^-\)`. It is an Arrhenius acid.

Therefore, the Arrhenius acids among the given options are
`\(H_3PO_3\)` (c) and
`\(HI\)` (d).