Question

Give the following a number 1-7 where 1 is the solution with the lowest pH and 7 is the solution with the highest pH. Each solution is 0.10 M.

C₆H₅NH₂
H₂SO₄
NaOH
H₃BO₃
HONH₃I
CaCl₂
NaCN

Answer 1

1.H2SO4: h2so4 is the strongest acid among these because it is completely ionised in water .

In water it give H+ and HSO4^​​​- ion.

2.HONH3I: is is the second most acidic in the list. It is a salt of strong acid and weak base .and salt of strong acid and weak base are acidic.

3.H3BO3: IT is the 3rd in the order and it is the weakest acid in the list because it dose not give any hydrogen ion its acidic character is due to by accepting hydroxyl ion.

4. CaCl2: it is a neutral compound among the list and in order it comes at no 4. It is neutral compound because it is a salt of strong acid and strong base.

Ca(OH)2+2HCl CaCl2+2H2O.

5.C6H5NH2: it is a weakest base among the list and it comes at no 5 in ph order.

6.NaCN: it is a salt of strong base NaOH and weak acid HCN. Hence it is basic in nature.

7.NaOH: it is the strongest base among the list and it is comes at number 7 in ph order among the list.

Ph: 1>2>3>4>5>6>7(acidic to basic)=

H2so4>honh3i>h3bo3>cacl2>c6h5nh2>nacn>naoh.