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5. Test hrang hrang: 1.1.
1. Formic Acid hman tur: 1.1.
ani. Tih dan: Sample 5 g vel (technical balance hmangin) 100 ml beaker-ah rit rawh. Phenolphthalein indicator solution 2 drops dah la, 2 N NaOH solution hmangin a rawng sen a lo lang thlengin neutralize rawh. Water bath-ah original volume chanve thlengin vawt rawh. Cool la, concentrated HCl 5 ml hmangin acidify la, 250 ml iodine flask-ah tui 50 ml leh 0.1 N NaBrO solution 50 ml awmnaah quantitative-in transfer rawh. Stopper khauh takin dah la, mix tha la, minute 30 vel dah la. 16.5% KI solution 15 ml, 6 N HCl 20 ml, leh starch indicator solution 2 ml te dah la. 0.1 N Na2S2O3 solution hmangin blue color a bo thlengin titrate (endpoint). Blank test chu a rualin tih tur a ni.
b. Chhiar dan: (Blank ml – Sample ml) × 0.1 (Normality) × 0.02301 = HCOOH gram a ni
c. Grade Glacial Acetic Note: NaOH dah hnua tui bath-a tihlum hian acetaldehyde chu a vawt a, a paih chhuah tum a ni a, chutiang a nih loh chuan result sang tak a awm thei ang.Grade Glacial Acetic.
2. Acetaldehyde hmanga siam a ni: 1.1.
ani. Tih dan: Iodine flask 250 ml-ah glacial acetic acid (technical balance hmangin) 10 g vel rit la. Tui 50 ml dah la, chutah chuan 4% NaHSO3 solution 10 ml chiah chu flask chhungah pipette rawh. Stopper khauh takin dah la, vawt la, minute 30 vel ding turin dah rawh. Starch indicator solution 2 ml dah la, 0.1 N Iodine solution hmangin blue color a lo lang thlengin titrate rawh (endpoint). Blank test chu a rualin tih tur a ni.
b. Chhiar dan: (Blank ml – Sample ml) × 0.1 (Normality) × 0.02203 = CH3CHO gram
6. Reagent buatsaih dan: 1.1.
0.1 N Sodium Hypobromite (NaBrO) Solution: Tui 500 ml ah bromine 2.8 ml dah la. 2 N NaOH 100 ml dah la, a hmin hma chu stir rawh. Tui nen 1000 ml thleng dilute la, 0.1 N NaBrO solution chu i hmu ang.
6. Grade Glacial Acetic Reagent siam dan tur: 1.1.
0.1 N Sodium Hypobromite (NaBrO) Solution: Tui 500 ml ah bromine 2.8 ml dah la. 2 N NaOH 100 ml dah la, a hmin hma chu stir rawh. Tui nen 1000 ml thleng dilute la, 0.1 N NaBrO solution chu i hmu ang.