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Strong and Weak Acids and Bases

a What are or...

Question

(a) What are organic acids and mineral acids?
(b) What colour does phenolphthalein indicator turn when added to colourless solution of sodium hydroxide?
[2 Marks]

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Solution

(a) Organic acids are acids present in plant materials and animals. These are naturally occurring acid. A mineral acid (or inorganic acid) is an acid derived from one or more minerals in the earth.
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(b) The color of phenolphthalein in the basic medium is pink. Therefore, adding phenolphthalein to sodium hydroxide solution will change the colour of the solution from colourless to pink.
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Q. (a) What is produced if an acid is added to a base?
(b) Why does dry HCl gas not change the colour of dry litmus paper?
(c) What colour does phenolphthalein indicator turn when added to an alkali (such as sodium hydroxide)?

Q. Mention the colour changes observed when the following indicators are added to acids:
(a) Alkaline phenolphthalein solution.
(b) Methyl orange solution.
(c) Neutral litmus solution.

Q. In order to study the neutralisation reaction of acid and base, a student took 10 mL of dilute hydrochloric acid in a conical flask and added a few drops of phenolphthalein indicator to it. He then added dilute sodium hydroxide solution to the conical flask dropwise with a dropper while shaking the conical flask constantly. When the acid is completely neutralised by the base, the solution in conical flask will turn :
(1) slightly red
(2) slightly yellow
(3) colourless
(4) slightly pink

(a) What are organic acids and mineral acids?

(b) Give two examples each of organic acids and mineral acids.

(c) What colour does phenolphthalein indicator turn when added to an alkali (such as sodium hydroxide)?
[3 Marks]

Q. What colour does phenolphthalein indicator turn when added to an alkali (such as sodium hydroxide)?

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