d. Short Answer Questions :
1. How is China rose indicators prepared?
2. What is a base?
03. What are universal indicators?
4. Give two uses of each:
(a) Calcium Hydroxide (b) Sodium Hydroxide
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Answers
Explanation:
1.First collect some China rose petals and collect them in beaker. Add some warm water. Then keep the China rose petals immersed in water for some time till the water in the beaker turn into light pink colour. ... Those light pink colour solution is the China rose indicator.
2.China rose converts acidic solution to dark pink, basic solutions to green colour and has no colour change for neutral solutions. China rose is a natural indicator and is used to identify the acidic or basic nature of a solution.
3.universal indicator is a pH indicator made of a solution of several compounds that exhibits several smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions. ... Wide-range pH test papers with distinct colours for each pH from 1 to 14 are also available.
4.Calcium hydroxide is an odorless white powder. It's used in industrial settings, such as sewage treatment, paper production, construction, and food processing.
It is major ingredient in drain and oven cleaners.
It is used in chemical manufacturing, oil refining, hydraulic fracturing, water treatment and metal processing.
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