Strength Of Acid And Base Solutions|The pH Scale|Universal Indicator With Examples

Relative Strength Of Weak Acid And Bases

A salt is dissovled in water and the pH of this salt solution is measured with a universal indicator papre. If the pH of solution is less than 7, the salt is most likely to e:

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In a experiment to measure the pH values of solutions, a student placed strips of universal indicator paper in foru beakes containig solutions A,B, C and D. The colour of universal indicator paper in these solutions is a shown below: The solution having lowes pH value is:

The pH of a weak mono acidic base, neutralized upto 80% with a strong acid in a dilute solution, is 7.40. The ionization constant of the base is

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Here are some results of solutions tested with universal indicator paper: Sulphuric acid: Red Metal polish : Dark blue Washing-up liquid : Yellow Milk of magnesia : Light blue Oven cleaner : Purple Car battery acid : Pink Arrange the solutions in order of their increasing pH values (starting with the one with the lowest pH).

In an experiment to measure the pH values by using a universal a universal indicator a student found that the pH values of four given solution A,B,C and D are 10,6,2 and 14 respectively. The solution which will require the maximum volume of sodium hydroxide solutioin for complete neutralisation is solution:

The rapid change of pH near the stoichiometric point of an acid base titration is the basis of indicator detectio. pH of the solution is related to ratio of the concentrations of the conjugate acid (Hin) and base (In^(-)) forms of the indicator given by the expression