Q: Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. How will you identify them? You have only turmeric indicator.
Answers
Answer:
Turmeric is a good indicator of acids and bases. It turns red in bases whereas it is yellow in both acids and neutral solutions. When we mix turmeric to the three liquids, sodium hydroxide turns it into red so we conclude that it is a base. Hydrochloric acid and sugar solution keep turmeric in yellow colour.
Well as there are three liquids and just and just turmeric indicator.
So test some of your three solutions with turmeric, and the one that turns the indicator pink is the sodium hydroxide solution.
Now that you know which is NaOH, mix some of this solution separately with some of the other two solutions. The one that gets warmer is the HCl - the neutralisation of HCl with NaOH is exothermic. There is no (rapid) reaction of sugar solution with NaOH so it shouldn't change temperature by much.