Question

(d)
silver
1
Double amount of hydrochloric acid is mixed with sodium hydroxide solution,
both having the same concentration. The pH of the resulting solution is checked
with pH paper. What would be the colour obtained?
2
3
4
5
6
7
7
8
9
10
11
12
13
14
Red
Yellow
Green
Blue
(a) Yellow
(b) Blue
(c) Yellowish green
(d) Red
Pre Board Examination
CB/X/1920
Page 5 of 12​

Answer 1

The Double amount of hydrochloric acid is mixed with sodium hydroxide solution, both having the same concentration. The pH of the resulting solution is checked with pH paper.

Explanation:

Chemical nature

Every substance has certain nature either it is :

Acidic

Basic

Neutral

These nature can be checked by using indicators or pH paper .

pH paper

1. It is a special litmus paper that helps us to know the nature .
2. It comes in three  types—red, blue, and neutral.

• With acid - Changes blue litmus red
• With base - changes red litmus blue
• With neutral substance -No effect

3.When Double amount of hydrochloric acid is mixed with sodium hydroxide solution, both having the same concentration.

4.The pH of the resulting solution is checked  with pH paper will changes it from  blue to red .The reason being it has double amount of Hydrochloric acid content .