Question

The diagram below shows the PH values of several substances.

(A) Based on PH value for substances K and M, what are the changes observed when we are testing the substances by using the blue litmus paper?

K : Blue -> ?
M : Blue -> ?

(B) Give example of substances/solutions for :
L =
M =​

Answer 1

Changes in colour of litmus paper.

• Blue litmus turns red under acidic conditions.
• Red litmus turns blue under basic conditions.

Noe

PH values:-

• K=4
• M=11

K is acidic as pH is <7

Hence K will change the colour of blue litmus paper.

#B

Examples of substances

• K=Vinegar, Tomatoes.
• M=Milk of magnesia,Soap