Question

What changes (if any) will you observe in each of the following cases:
1. Blue litmus paper is introduced in a solution of sodium chloride.
2. A drop of phenolphthalein is added to a solution of potassium hydroxide.
3. Methyl orange is added to a solution of hydrochloric acid.
4. A drop of phenolphthalein is added to nitric acid.
5. Aluminium hydroxide is dehydrated.​

Answer 1

Answer:

Methyl orange is a pH indicator used in titrations because of its clear and distinct colour change. It shows red colour in acidic and yellow colour in basic medium.

Electrolysis of brine or sodium chloride solution produces sodium hydroxide, NaOH which is a strong base. Using methyl orange as an indicator gives a yellow colour solution for NaOH.

Answer 2

Answer:

• Litmus paper can be used as an indicator to know whether a given substance is acidic, basic or neutral in nature.
• Acidic substances turn blue litmus paper red but they have no effect on the red litmus paper.
• Basic substances turn red litmus paper blue but have no effect on the blue litmus paper.
• On the other hand, neutral substances have no effect on the blue as well as the red litmus paper..

• The colour of the final mixture when added HCl to it
• The colour (pink colour) will disappear.
• the reaction between an acid and a base is known as neutralisation in this reaction and acid neutralizes the effect of acid and a base this reaction result in the formation of salt and water and energy in the form of heat is evolved.

• When methyl orange is used as an indicator with acid, the color of the solution turns red. When methyl orange is used as an indicator with base, the color of the solution turns yellow. As dilute hydrochloric is acidic in nature, when methyl orange is added to it, the color of the solution turns red

• phenolphthalein gives no colour when added to an acidic solution. Phenolphthalein is an acid indicator,means when we add water (pH 7) to it,it ionises giving a pink colour. If concentration of is greater than that of then the solution will be colourless

• Aluminum hydroxide is an inorganic salt used as an antacid. It is a basic compound that acts by neutralizing hydrochloric acid in gastric secretions. Subsequent increases in pH may inhibit the action of pepsin. An increase in bicarbonate ions and prostaglandins may also confer cytoprotective effects..

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