Question 1 What does pH of a solution signify?
Question 2 You have 2 solutions A and B. The pH of solution A is 6 and pH of solution B is 8.Which of the solution has more hydrogen ion concentration?
Question 3 Three solutions A,B and C have pH values of 6,4 and 10.Which of the solution is highly acidic?
Question 4 The pH of a solution is 5.What will be its action on blue and red litmus?
Question 5 Name the scientist who discovered pH scale?
Question 6 Two solutions A and B have pH values of 3 and 9.Which will turn phenolphthalein from colourless to pink?
Question 7 What is the pH of neutral solution?
Question 8 Fresh milk has a pH of 6>how do you think the ph would change as it turns into curd?
Question 9 What effect does the concentration of hydrogen ion have on nature of the solution?
Strength of acid and base: pH Scale
In pure water [H+] = [OH–]
1) Pure water + acid(produce H+) ——-> Concentration of hydrogen ion(H+) increases Solution will have more of hydrogen ion(H+).
2) Pure Water + base (Produce OH-)———>Concentration of OH- increases Solution will have more of OH- ions.
In 1909 Sorenson gave a scale known as pH scale.The strength of an acid as well as basic solution can be represented by making use of Hydrogen ion concentration (H+)in them.The pH of a solution is inversely proportional to hydrogen ion in it.High the concentration of hydrogen ion lower will be its pH.Lower the concentration of hydrogen ion Higher will be its pH.
P represents potenz means power whereas H represents concentration.
The strength of an acid or base is measured on a scale of numbers called pH scale (0-14).
1) Neutral Solution
2) Acidic Solution
More acidic a solution is lesser will be its pH.
Solution with pH=0,1,2,3 are strong acids.
Solution with pH=4,5,6 are weak acids.
Lower the pH stronger will be the acid.
3) Basic solution
More basic a solution is more will be its pH.
Solution with pH=8,9,10 are weak base.
Solution with pH=11,12,13,14 are strong base.
Higher the pH,stronger will be a base.
Conc HCl pH=1
Conc NaOH pH=14