Question

16. i) What is meant by universal indicator?
ii) How is the hydrogen ion concentration determined of a solution?
iii) Why does a bee sting cause pain and irritation?
(3)
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Answer 1

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❥a substance that changes to different colours according to whether another substance that touches it is an acid or an alkali❤️

❥In this way, pH is determined by hydrogen-ion concentration. In the case of a neutral solution, [H+]=10-7 , which we call a pH of 7. This means, for example, that a hydrogen-ion concentration of a solution with a pH of 4 is 10-4mol/l, meaning it contains 0.0001 mol of hydrogen ions in a solution of 1 liter.❤️

❥First, when bees sting they release a chemical called melittin into their victim. This venom immediately triggers pain receptors, causing a burning sensation. Second, because a bee's stinger is in fact barbed like a jagged sword, when it penetrates the victim's skin it actually dislodges from the bee, remaining there❤️

Answer 2

Answer:

1. these are the chemical which gives us the differentiation between acid, bases, salts etc...
2. by checking it's pH...
3. because it has chemical in its sting.....