question * (1 point)\nwhich equation best describes the interaction of a weak base with water?\na…

Explanation:

Step1: Define a weak - base reaction with water

A weak base in water accepts a proton ($H^+$) from water to form its conjugate acid and hydroxide ions ($OH^-$). The reaction is reversible.

Step2: Analyze option A

$NaOH_{(aq)}\rightarrow Na^+{(aq)}+OH^-{(aq)}$ is the dissociation of a strong base ($NaOH$) in water, not a weak - base reaction.

Step3: Analyze option B

$CH_3CH_2OH_{(l)}\rightarrow CH_3CH_2OH_{(aq)}$ is just the dissolution of ethanol in water, not a base - water reaction.

Step4: Analyze option C

$HPO_{4}^{2 - }+H_2O_{(l)}\rightleftharpoons PO_{4}^{3 - }+H_3O^+{(aq)}$ is the reaction of a weak acid ($HPO{4}^{2 - }$) donating a proton to water to form its conjugate base ($PO_{4}^{3 - }$) and hydronium ions.

Step5: Analyze option D

$N_2H_{4(aq)}+H_2O_{(l)}\rightleftharpoons N_2H_{5}^{+}{(aq)}+OH^-{(aq)}$ shows hydrazine ($N_2H_4$), a weak base, accepting a proton from water to form its conjugate acid ($N_2H_{5}^{+}$) and hydroxide ions. This is a typical weak - base reaction with water.

Answer:

D. $N_2H_{4(aq)}+H_2O_{(l)}\rightleftharpoons N_2H_{5}^{+}{(aq)}+OH^-{(aq)}$