Vinegar is a solution of (A) 50% – 60% acetic acid in alcohol (B) 5% – 8% acetic acid in alcohol

Homogeneous mixture - soda water, air, vinegar, filtered tea.  Heterogeneous mixture - wood, soil.

(a) sour, acids (b) natural (c) pink (d) neutralise, salt

(C) a homogeneous solution is formed

The correct answer is (B) ii

(d) It smells like vinegar and turns blue litmus to red.

Acetic acid is colourless liquid. It is miscible/ soluble in water. On adding a pinch of sodium hydrogen carbonate, Brisk effervescence is observed. Evolution of a colourless/ odourless gas.

(b) Formic acid is stronger than acetic acid due to its chemical composition. Formic acid is an organic acid as well as active acid in an organic acid.

It is 10-4 ......

M=n/V  =w2/M2 x V  = 0.63x1000/63 mol-1L-1  =0.01 molL-1  [H+ ] =[HNO3] =10-2   PH = - log(H+ )   = - log(10-2 )   = -(-2)log10   PH =2

(c) When ants bite, they inject formic acid in the muscle tissue. This formic acid is found at the mandible of ants.