Back to FAQs
Related FAQs

Frequently Asked Question

Questions asked by users might not always be phrased in the clearest way.

How to calculate an estimate of ph of NH3

Accepted Answer

NH3 is a weak base. To estimate its pH, you'll need to consider its Kb (base dissociation constant) and the initial concentration. Here's how:
1. Write the equilibrium reaction: NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH-(aq)
2. Set up an ICE table:
| | NH3 | NH4+ | OH- |
|-------------|--------|--------|--------|
| Initial | [NH3] | 0 | 0 |
| Change | -x | +x | +x |
| Equilibrium | [NH3]-x| x | x |
3. Use the Kb expression: Kb = [NH4+][OH-] / [NH3]. Substitute the equilibrium concentrations from the ICE table.
4. Solve for x: x will represent the [OH-] concentration.
5. Calculate pOH: pOH = -log[OH-]
6. Calculate pH: pH = 14 - pOH

Articles you might like

Discover more articles
🚀 Welcome to TheAiWay! ChemistAI has evolved into TheAiWay.org, offering faster speeds, expanded AI-powered content across 32 subjects, and a brand-new, user-friendly design. Enjoy enhanced stability, increased query limits (30 to 100), and even unlimited features! Discover TheAiWay.org today! ×