You have four solutions A, B, C and D. The pH of solution A is 6, B is 9, C is 12 and D is 7. (i) identify the most acidic and the most basic of the solutions. (ii) Arrange the above four solutions in the increasing order of the H+ ion concentration. (iii) State the change in colour of pH paper on dipping in solution C and D.

You have four solutions A, B, C and D. The pH of solution A is 6, B is

1.	You have four solutions A, B, C and D. The pH of solution A is 6, B is 9, C is 12 and D is 7. (i) identify the most acidic and the most basic of the solutions. (ii) Arrange the above four solutions in the increasing order of the H+ ion concentration. (iii) State the change in colour of pH paper on dipping in solution C and D.
Answer» Solution :(i) HCl will give rise to more `H^+` ions and `CH_3COOH` produces less `H^+` ions on dissociations. The colour of pH paper DEPENDS on the concentration of `H^+` ion. Colour BECOMES red for HIGH `H^+` concentration. (ii) (a) Most ACIDIC- A most basic- C (B) C,B,D,A/C `lt` B `lt` D `lt` A (c ) In C blue in D green.