Question

If the pH values of solutions X, Y and Z are 13, 6 and 2 respectively, then 

a) Which solution is a strong acid? Why? 

b) Which solution contains ions along with molecules of solution? 

c) Which solution is a strong base? Why?

d) Does the pH value of a solution increase or decrease when a base is added to it? Why?

Answer 1

The strength of an acid (or) an alkali can be tested by using pH value of a solution. If the value of a pH of a solution is less, then that solution exhibits acidic nature. 

If the value of a pH of a solution is more, then that solution exhibits basic nature. 

pH value of a solution “X” is 13 

pH value of a solution “Y” is 6 

pH value of a solution “Z” is 2 

a) Solution ‘Z’ is strong acid because its pH is 2. 

b) Among given solutions, solution X is weakest acid. Weak solution contains ions along with molecules of solution. So X exhibits like this character. 

c) Solution X is strong base. Because its pH is 13. 

d) If base is added to solution ‘Z’, then its pH will increase.