The tube 1 to heat a pot of boiling water for 2 minutes
tube 2 into acetic acid concentration of 5 drip
tube 3. Put a solution of NaOH 6 mol / dm³
tube 4 into ethanol 95% 5 drip
tube 5. Put the solution 0.5 mol / dm³ 5 drops
observe changes recorded.
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