Determine the percent ionization of a 0.125 M HCN solution.

Guida verificata passo dopo passo

Identify the relevant chemical equation for the ionization of HCN: \( \text{HCN} \rightleftharpoons \text{H}^+ + \text{CN}^- \).

Write the expression for the acid dissociation constant \( K_a \) for HCN: \( K_a = \frac{[\text{H}^+][\text{CN}^-]}{[\text{HCN}]} \).

Look up the \( K_a \) value for HCN, which is typically around \( 6.2 \times 10^{-10} \).

Set up an ICE (Initial, Change, Equilibrium) table to determine the concentrations of \( \text{H}^+ \), \( \text{CN}^- \), and \( \text{HCN} \) at equilibrium.

Calculate the percent ionization using the formula: \( \text{Percent Ionization} = \left( \frac{[\text{H}^+]}{[\text{HCN}]_0} \right) \times 100\% \), where \([\text{HCN}]_0\) is the initial concentration of HCN.

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.

Durata del video:

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Ionization of Weak Acids

Weak acids, like hydrocyanic acid (HCN), do not completely dissociate in solution. Instead, they establish an equilibrium between the undissociated acid and its ions. The degree to which a weak acid ionizes is crucial for calculating properties such as pH and percent ionization.

Video consigliato:

Percorso guidato

01:15

Calculating Percent Ionization of Weak Acids

Equilibrium Constant (Ka)

The acid dissociation constant (Ka) quantifies the strength of a weak acid by measuring the extent of ionization at equilibrium. For HCN, the expression for Ka is derived from the concentrations of the products (H+ and CN-) and the reactant (HCN) at equilibrium, which is essential for calculating percent ionization.

Video consigliato:

Percorso guidato

01:14

Equilibrium Constant K

Percent Ionization Calculation

Percent ionization is calculated by taking the concentration of ionized acid at equilibrium, dividing it by the initial concentration of the acid, and multiplying by 100. This metric provides insight into the strength of the acid and its behavior in solution, which is vital for understanding the properties of HCN in this context.

Video consigliato:

Percorso guidato

01:15

Calculating Percent Ionization of Weak Acids

Pratica correlata

Domanda del libro di testo

Determine the percent ionization of a 0.225 M solution of benzoic acid.

1411

views

Domanda del libro di testo

Calculate the percent ionization of a formic acid solution having the given concentration. a. 1.00 M

1148