Question

4. Phenolphthalein turns
in basic
solution.
5. When water is added to a strong acid, it becomes
or
6. An antbite can be treated by applying a/an
substance.
7. The base which is
in water is called
alkali.​

Answer 1

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Answer:

4) pink

5) it evolves heat

6) meat tenderizer

7) Arrhenius bases

Explanation:

4) Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions.

5) When water is added to a strong acid, the reaction will evolve heat which is extremely dangerous. Hence, to dilute a strong acid, the acid should be slowly added to the water followed by regular stirring.

6) A few examples of chemical substances that can be used for neutralizing ant bite and its toxic venom are - Meat tenderizer that contains papain, a proteolytic enzyme; a mixture of Baking Soda and Benedryl (diphenhydramine); a mixture of 0.5% camphor + 0.5% menthol; a solution of half bleach and half water; Ammonia

8) Alkalis are all Arrhenius bases, ones which form hydroxide ions (OH−) when dissolved in water. Common properties of alkaline aqueous solutions include: Moderately concentrated solutions (over 10−3 M) have a pH of 7.1 or greater. This means that they will turn phenolphthalein from colorless to pink.

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