video tutorial Preparation of potassium periodate

Name: video tutorial - Preparation of potassium periodate
Uploaded: 2025-12-11T09:03:44.239Z
Duration: 10 min 5 s
Description: That's all for this video.

Goal: prepare potassium periodate (KIO4) by oxidizing iodate in hot alkaline solution while passing chlorine through the mixture.
Apparatus: chlorine-generation setup with a two-neck flask, addition funnel, calcium chloride drying stage, tubing to a conical reaction flask on a hot plate with stirring and a thermometer.
Reagents: potassium permanganate (KMnO4) as chlorine source; 70 mL of concentrated acid solution to generate Cl2; potassium hydroxide (KOH) solution; potassium iodate (KIO3) from prior step.
Procedure: dissolve 20 g KOH in water (two 100 mL portions); heat to about 90–100 °C; add 25 g KIO3; gradually add more KOH to raise temperature; bubble chlorine slowly through the hot mixture; maintain near 90 °C; after ~1 hour of acid addition, allow remaining chlorine gas generation; potassium periodate precipitates as the solution cools; filter and wash.
Product: potassium periodate, about 27.0 g obtained; theoretical yield 26.8 g; nearly quantitative yield; final solid is dry, fluffy yet dense, slightly off-white.
Notes: KIO4 can be used as an oxidant in organic chemistry; the sodium iodate route differs (orthoperiodates require further study).