Description
⚗️ Potassium Hydroxide (KOH) — preferred over NaOH for pH adjustment of TC media when sodium-free conditions are required, or in species sensitive to sodium accumulation.
| 🧪 CAS | 1310-58-3 | ⚖️ MW | 56.11 g/mol |
| 🔬 Grade | TC / Laboratory | 🌡️ Storage | RT, tightly sealed — hygroscopic |
⚗️ KOH vs NaOH in TC
Most TC protocols are indifferent to whether you use KOH or NaOH for pH adjustment — the amount added is tiny relative to total medium composition. However, KOH is recommended when: (1) the medium already has high Na⁺ (e.g., high-ammonium formulations); (2) studying sodium sensitivity or sodium exclusion in halophyte/glycophyte comparisons; (3) the published protocol specifically uses KOH (follow the protocol). For routine MS pH adjustment either is fine.
💡 Prepare 1M KOH: dissolve 5.6 g KOH pellets in 100 mL distilled water. Same hygroscopic caution as NaOH — keep tightly sealed.
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