Answer to Question #166620 in Chemistry for Rena Patel

Question

In the following equation, label the Bronsted-Lowry acid, base and conjugate pairs. (2 marks)

CH3NH2 (aq) + H2PO4- (aq) ↔

CH3NH3+ (aq) +

pOH

HPO42- (aq)

Answer 1

CH₃NH₂ (aq) + H₂PO₄^- (aq) ↔ CH₃NH₃⁺ (aq) + HPO₄^2- (aq)

Here, CH₃NH₂ accepts a proton while H₂PO₄^- donates this proton. From here, conjugate pairs are:

1. H₂PO₄^- - acid, HPO₄^2- - conjugate base
2. CH₃NH₂ - base, CH₃NH₃⁺ - conjugate acid