3. Calcium Formate a chunglei hngalh khawhnak
3.1 Calcium Formate Lamthluan Hmuhning: Tlawmpal alkaline calcium formate cawhmi ah, potassium permanganate standard cawhmi a tam deuhmi cawh. Oxidation thlennak cu a dih tiang a kal khawh nakhnga lumter. A tam tukmi potassium permanganate nih potassium iodide chungin iodine kha a almi cawhmi ah a chuahter lai, cu cu sodium thiosulfate standard cawhnuk in a thlen lai.
3.2 Calcium Formate Hngalh khawhnak Lam: Calcium formate sample (0.0002g tiang a dikmi) 0.4g hrawng rit, 250ml volumetric flask chungah chiah, ti ah cawh, hmelchunhnak tiang cawh, cun ttha tein hninh. Hi cawhnuk 25.00ml (asiloah 10ml) kha iodine thawl chungah cawh law, ti um lomi sodium carbonate 0.2g cawh law, ttha tein hninh. Potassium permanganate cawhnuk 50.00ml (asiloah 20ml) kha a dikthliar in cawh, ti hnimhnak ah minutes 30 chung lumter, cun lumter. Sulfuric acid 6ml le potassium iodide 2g cawh law, minutes 5 chung muilak ah chiah. Sodium thiosulfate standard solution in titrate tuah; a donghnak pawng ah, 3ml starch hmelchunhnak (0.5%) cawh law, a senmi rong a tlau hlan tiang titrate tuah peng. Blank test kha caankhatte ah tuah.

Calcium formate nih a tei khawh lomi ṭhatnak kha kawl—na thilri rianṭuannak kha ṭhanchoter law man kha tlawmter! Tam deuh in hngalh na duh maw? Aa tlakmi a phi hmuh awkah a tu ah hal awkah hmet!