Question

When hydrochloric acid is added to sodium hydroxide solution, sodium chloride and water are formed.
(a) Name this reaction.
(b) What changes in colour will be observed when
(i) A strip of blue litmus paper is dipped in it.
(ii) A strip of red litmus paper is dipped in it.
(c) A test tube is filled with a solution (X). When a few drops of phenolphthalein are added to this solution, the colour becomes pink. Identify if solution (X) is an acid or a base.
(d) How will you test that a solution is acidic or basic using China rose indicator?

Answer 1

Answer:

neutralisation reaction

color of litmus paper will not change

Answer 2

Answer:

a)Neutralisation

b)in hcl it will red and ii) in naoh blue and when dipped in nacl no colour change as itis neutral salt.

c) solution is base. naoh

d) magenta(dark pink) in acid and green in base.