Question

Rehan mixed a solution of potassium hydroxide with dilute hydrochloric acid and saw that the resulting solution did not change the colour of the litmus and phenolphthalein indicators.



A.How do neutralisation reactions help us?.​

Answer 1

Answer:

Reaction:-

KOH+HCl(dil)-->KCl(salt)+H2O(water)

Neutralizing help us in many ways:-

• As salt and water both are safe and good for our health so it has many applications.
• Mg(OH)2 is used to treate acidity in our stomach.
• NaOH(caustic soda) is used for washing purposes.

More information:-

• The pH scale(most commonly) we use to see a uniform spectrum of colours for acids ,base or neutral solutions.
• Also we can use indicators such as litmus , phenolphthalein , methyl orange etc.
• The reaction between acid and salt is called neutralisation.
• Neutral colours do not change the colour of indicators.