Question

Determine whether each of the following is a strong acid, a weak acid, or a species with negligible acidity.Drag the appropriate items to their respective bins.ResetHelpCH3NH3+(an ion related to NH4+)C H Subscript 3 N H Subscript 3 Superscript ,+ (an ion related to N H Subscript 4 Superscript ,+ )HPO42−H P O Subscript 4 Superscript ,2-CH4C H Subscript 4HNO2H N O Subscript 2H2SO4

Answer 1

Answer:

CH₃NH₃⁺ is a weak acid.

HPO₄²⁻ has a negligible acidity.

CH₄ has a negligible acidity.

HNO₂ is a weak acid.

Explanation:

There are 7 strong acids: HCl, HBr, HI, HNO₃, H₂SO₄, HClO₃, HClO₄. The rest of the acids are weak.

CH₃NH₃⁺ is a weak acid, according to the following equation:

CH₃NH₃⁺ ⇄ CH₃NH₂ + H⁺

HPO₄²⁻ can act as an acid or as a base:

Acid reaction: HPO₄²⁻ ⇄ PO₄³⁻ + H⁺

Basic reaction: HPO₄² + H₂O ⇄ H₂PO₄⁻ + OH⁻

Given Kb > Ka,  HPO₄²⁻ has a negligible acidity.

CH₄ cannot release nor accept H⁺ so it has a negligible acidity.

HNO₂ is a weak acid, according to the following reaction:

HNO₂ ⇄ H⁺ + NO₂⁻