DANCE350 Lecture Notes - Sodium Bromide, Sarvepalli Radhakrishnan, Sodium Hydroxide
27 Nov 2013
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Experiment 1: the problem of 9 unknown solutions. This experiment requires students to identify 9 unknown solutions which have been given without any other reagents. 6 m naoh 0. 5 m na2s 0. 2 m bacl2. 3 m nh4cl 0. 3 m na2so4 0. 2 m kio3. 1 m nabr 0. 5 m kclo3 0. 1 m agno3. Preparing about 3~4 drops of each solution as sample in test tube, we can smell and find out which solution has pungent odor. Next, we can label it as nh4cl solution. Nh4cl solution reacts with the other solutions till the test tube appears white precipitate. We can identify the rest of the solutions using agno3 solution. Preparing about 2~3 drops of remaining 8 solutions as sample in test tube, we need to add 1~2 drops agno3 solution to these test tubes. If the test tube appears fairly light brown solid, it contained the naoh solution. If the test tube appears lightly yellow precipitate, it contained the nabr solution.
