24 Questions
In order to express smaller concentrations for acid, neutral and alkaline solutions in a more convenient way, Sorensen in 1909 introduced a new scale which is known as ______ scale.
pH
It is based on the equation. $pH = -log_{10}[H^+]$ pH can thus be defined as below: pH of a solution is the logarithm of hydrogen ion concentration with a negative sign. The concentration of hydrogen ions in pure water is 0.0000001 per litre or [10^-7] pH = -log_{10}[10^-7] pH = 7 We know that water is ______. So, any solution of pH 7 will be ______.
neutral, neutral
It is clear from the scale that total range of pH value is from ______ to ______.
0, 14
Pure water or all neutral solutions have a pH of ______.
7
If the concentration of H+ ions is greater than that in pure water i.e., it is above 10^-7, the solution is ______ and pH value lesser than 7 up to zero.
acidic
Conversely if the H+ ion concentration is lesser than that in pure water, the solution is ______ and pH is larger number than 7 up to 10.
basic
Find the pH of 0.1 N HCl Solution. Soln: HCl + H2O H3O + + ClHere, [HCl] = [H3O +] = 0.1 N = 10^-1 N pH = -log_{10}[H3O +] ⸫ pH = -log_{10}[10^-1] ⸫ pH = -(-1) log_{10} (because, log (a)n = n log (a)) ⸫ pH = 1 (because, log_{a} (a) = 1) ______
1
Find the pH of 0.005 N H2SO4 Solution. Soln: H2SO4 + 2H2O 2H3O + Here, [H2SO4] = [0.005] N = 5 x 10^-3 N ⸫ [H3O +] = 2 [H2SO4] = 2 x 5 x 10^-3 N = 10 x 10^-3 N = 10^-2 N pH = -log_{10}[H3O +] ⸫ pH = -log_{10}[10^-2] ⸫ pH = -(-2) log_{10} ⸫ pH = ______
2
What is a solution?
A homogeneous mixture of one or more solutes dissolved in a solvent.
Define pH.
pH is the logarithm of hydrogen ion concentration with a negative sign.
What is the substance that dissolves in a solvent to produce a homogeneous mixture called?
Solute
What is the ionic product of water and how is it expressed?
The product concentration of H+ and OH- ions present in water. It is expressed as kw.
What is the concentration of H+ ions in a solution?
The number of gram ions present in one litre of it.
What is the pH of a 0.005 N H2SO4 Solution?
2
What is the pH of a neutral solution?
7
What is the pH of a 0.1 N HCl solution?
1
What is the pH of a 0.005 N H2SO4 solution?
2
What is the pH of a 0.1 N KOH solution?
13
What is the range of pH values according to the scale mentioned in the text?
0 to 14
What does pH measure?
Hydrogen ion concentration
What is the ionic product of water expressed as?
1 x 10^-14 gms ion/litre
What does a pH of 7 indicate for a solution?
Neutral
What type of solution has a pH value greater than 7 up to 14?
Basic/Alkaline solution
What type of solution has a pH value less than 7 down to 0?
Acidic solution
This quiz provides a basic introduction to the concepts of solution, value, and volumetric analysis of pH with practical examples. It covers the determination of hydrogen ion concentration, the neutral nature of pure water, and the characteristics of acid solutions.
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